Oral Care Compositions Comprising Fluoride

ABSTRACT

Oral care compositions and/or unit-dose oral care compositions with a fluoride ion source. Oral care compositions and/or unit-dose oral care compositions with a high average fluoride ion uptake. Oral care compositions with one or more web forming materials, a calcium ion source, and a fluoride ion source with a high average fluoride uptake.

FIELD OF THE INVENTION

The present invention relates to oral care compositions comprising a fluoride ion source. The present invention also relates to unit-dose oral care compositions comprising a fluoride ion source. The present invention also relates to oral care compositions and/or unit-dose oral care compositions with a high average fluoride ion uptake.

BACKGROUND OF THE INVENTION

Dentifrice compositions are typically formulated as a paste that can be squeezed out of a tube. Dentifrice compositions can include metal ions, fluoride ions, abrasives, calcium sources, surfactants, whitening agents, humectants, thickening agents, and other formulation ingredients. Typically, dentifrice compositions must be carefully formulated to avoid reactivity in the tube, but retain reactivity in the oral cavity. In many cases, ingredients must be substituted or removed to balance reactivity in the tube with in-mouth benefits.

Specifically, fluoride ions sources, such as sodium fluoride, stannous fluoride, and/or sodium monofluorophosphate, among others, can be added to dentifrice compositions to deliver anti-caries benefits. However, fluoride ion sources can be difficult to incorporate into dentifrice and/or oral care compositions due to the reactivity between fluoride ions and other dentifrice components, such as calcium ions.

Fluoride ions provide an anticavity benefit through the uptake of fluoride ions into enamel. The interaction of fluoride with the mineral component of teeth (known as hydroxyapatite or HAP) produces a fluorohydroxyapatite (FAP) mineral, through the substitution of OH⁻ in HAP with F⁻. Fluoride incorporation into the dental enamel as FAP results in increased hydrogen bonding, a denser crystal lattice, and an overall decrease in the solubility of dental enamel. The incorporation of fluoride into the hydroxyapatite (HAP) lattice may occur while the tooth is forming or by ion exchange after it has erupted. Additionally, enamel solubility decreases with increasing amounts of fluoride incorporation. Thus, fluoride is routinely added to dentifrice and mouth rinses to strength the dental enamel of teeth.

Unfortunately, fluoride bioavailability can be significantly altered due to (i) chemical reactivity between the fluoride ion and other components, such as calcium ions, abrasive systems, chelants, and whitening agents, (ii) hydrolysis, and (iii) oxidation. Thus, fluoride bioavailability of fluoride ions in a paste are impacted based on the concentration and presence of other reactive components as a function of time as many fluoride compounds are prone to hydrolyze and/or oxidize while in the aqueous phase.

The incorporation of fluoride ions into dentifrice compositions is only possible by minimizing interactions between fluoride ions and other dentifrice components during storage to maximize fluoride ion availability for reactivity with oral cavity surfaces, such as enamel, dentine, gums, plaque, and bacteria and then releasing and dispersing fluoride ions into the oral cavity in a non-inferior fashion to a clinically relevant benchmark, such as a USP Reference Dentifrice, to ensure anticaries efficacy. Accordingly, there is a need for an oral care composition that minimizes reactivity between fluoride ion sources and other dentifrice components that also rapidly releases and disperses fluoride ions into the oral cavity in a non-inferior fashion to a clinically relevant benchmark.

SUMMARY OF THE INVENTION

Disclosed herein is a unit-dose oral care composition comprising (a) a fibrous composition formed from one or more web forming materials; (b) a fluoride ion source; and (c) an abrasive.

Disclosed herein is an oral care composition comprising (a) one or more web forming materials; (b) a calcium ion source; and (c) a fluoride ion source, wherein the oral care composition has an average fluoride uptake of at least about 1000 ppm.

Disclosed herein is an oral care composition comprising (a) one or more nonwoven web layers comprising (i) one or more web forming materials, and (ii) a fluoride ion source; and (b) a non-fibrous composition, the non-fibrous composition comprising a calcium ion source.

Disclosed herein is an oral care composition comprising (a) one or more nonwoven web layers comprising (i) one or more web forming materials, and (ii) a calcium ion source; and (b) a non-fibrous composition, the non-fibrous composition comprising a fluoride ion source.

Disclosed herein is an oral care composition comprising (a) one or more nonwoven web layers, the one or more nonwoven web layers comprising (i) one or more web forming materials, and (ii) a metal ion source comprising a stannous ion source, a zinc ion source, or combinations thereof; and (b) a non-fibrous composition, the non-fibrous composition comprising an abrasive.

Disclosed herein is an oral care composition comprising (a) one or more nonwoven web layers, the one or more nonwoven web layers comprising (i) one or more web forming materials, and (ii) an abrasive (b) a non-fibrous composition, the non-fibrous composition comprising a metal ion source comprising a stannous ion source, a zinc ion source, or combinations thereof.

Disclosed herein is a unit-dose oral care composition comprising fluoride, where the unit-dose oral care composition has a salivary fluoride pharmacokinetic area under the curve (pK AUC) that is at least 60% of the salivary fluoride pK AUC of a reference toothpaste

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to oral care compositions comprising a fluoride ion source. The present invention also relates to unit-dose oral care compositions comprising a fluoride ion source. The present invention also relates to oral care compositions and/or unit-dose oral care compositions with a high average fluoride ion uptake.

Embodiments of the present invention also relate to unit-dose oral care compositions including a non-inferior dose of fluoride. Unfortunately, fluoride release and dispersal from an oral care composition can be significantly altered due to (i) presence of excipients, (ii) dose form, (iii) concentration of fluoride, (iv) dose of fluoride, (v) distribution of fluoride within a heterogeneous composition, and (vi) manufacturer's usage instructions. Accordingly, solid or semi-solid unit-dose oral care compositions can suffer from lower-than-expected delivery of fluoride ion to the oral cavity. Thus, the present application is directed to unit-dose oral care compositions including a higher dose of fluoride, i.e., a non-inferior dose, to allow for a rapid and thorough release of fluoride to the oral cavity.

Fluoride ion sources can be difficult to formulate in oral care compositions due to reactivity with other ingredients in the oral care compositions and/or the oxidation or hydrolysis of fluoride ion sources in aqueous oral care compositions.

The present invention is directed to oral care compositions that use assembled design to physically separate fluoride ions from other reactive components of the oral care composition. For example, the fluoride ion can be in one location of the oral care composition and the calcium ion source or calcium abrasive can in a separate location of the oral care composition. While dentifrice reactivity is typically manipulated through formulation design, the use of nonwoven webs will allow for dentifrice reactivity to be dramatically lowered by separating components by placing them in the solid phase, where reactivity is lower, or physically separating the ingredients through assembly design of the oral care composition.

Definitions

To define more clearly the terms used herein, the following definitions are provided. Unless otherwise indicated, the following definitions are applicable to this disclosure. If a term is used in this disclosure but is not specifically defined herein, the definition from the IUPAC Compendium of Chemical Terminology, 2nd Ed (1997), can be applied, as long as that definition does not conflict with any other disclosure or definition applied herein, or render indefinite or non-enabled any claim to which that definition is applied.

The term “oral care composition” as used herein means a product that in the ordinary course of usage is retained in the oral cavity for a time sufficient to contact some or all of the dental surfaces and/or oral tissues for purposes of oral health. In one embodiment, the composition is retained in the oral cavity to deliver an oral care active agent. The oral composition of the present invention may be in various forms including toothpaste, dentifrice, tooth gel, tooth powders, tablets, rinse, sub gingival gel, foam, mousse, chewing gum, lipstick, sponge, floss, prophy paste, petrolatum gel, denture product, nonwoven web, or foam. In one embodiment, the oral composition is in the form of a nonwoven web. In another embodiment, the oral composition is in the form of a dentifrice. The oral composition may also be incorporated onto strips or films for direct application or attachment to oral surfaces or incorporated into floss. The oral care composition may also be a strip that can be directly applied to a surface of the oral cavity. The strip can at least partially dissolve upon contact with moisture or brushing.

The term “orally acceptable carrier” as used herein means a suitable vehicle or ingredient, which can be used to form and/or apply the present compositions to the oral cavity in a safe and effective manner.

The term “effective amount” as used herein means an amount of a compound or composition sufficient to induce a positive benefit, an oral health benefit, and/or an amount low enough to avoid serious side effects, i.e., to provide a reasonable benefit to risk ratio, within the sound judgment of a skilled artisan. Depending on the type of oral health benefit and the efficacy of active compound, “effective amount” means at least about 0.0001% of the material, 0.001% of the material, or 0.01 of the material, by weight of the composition.

The term “dentifrice” as used herein means paste, gel, powder, tablets, or liquid formulations, unless otherwise specified, that are used to clean, treat, or contact the surfaces of the oral cavity. Additionally, as disclosed herein, the dentifrice means a nonwoven web that are used to clean the surfaces of the oral cavity. The term “teeth” as used herein refers to natural teeth as well as artificial teeth or dental prosthesis.

As used herein, the term “filament” means a thin, flexible threadlike object that can be used to form a nonwoven web of the present type. The length of a filament can greatly exceed its diameter, i.e. a length to diameter ratio of at least about 5, 10, or 25.

The filaments of the present invention may be spun from nonwoven web forming materials via suitable spinning operations, such as meltblowing or spunbonding.

Filaments are typically considered continuous or substantially continuous in nature. Filaments are relatively longer than fibers. Non-limiting examples of filaments can include meltblown filaments, spunbond filaments, and combinations thereof. In one embodiment, the filaments are meltblown filaments.

In one example, the filaments may be in the form of fibers, such as when the filaments are cut to shorter lengths. Thus, in one example, the present invention also includes a fiber comprising the composition of the filament of the present invention.

As used herein, “nonwoven web forming material” means a composition that is suitable for making a filament such as by meltblowing, spunbonding, or fluid film fibrillation. The nonwoven web forming material comprises one or more nonwoven web forming materials that exhibit properties that make them suitable for spinning into a filament.

As used herein, “length”, with respect to a filament, means the length along the longest axis of the filament from one terminus to the other terminus. If a filament has a kink, curl or curves in it, then the length is the length along the entire path of the filament.

As used herein, “average diameter”, with respect to a filament, is measured according to the Diameter Test Method described herein.

As used herein, the term “disintegratable” and “disintegration” means that the oral care composition, filament, or nonwoven is reduced to components, fragments or compositions when exposed to conditions of intended use.

As used herein, the term “dissolves” means that the oral care composition, filament, or nonwoven web is mostly or completely solubilized. The oral care composition may appear to visibly dissolve even though some of the components do not completely dissolve—for example cross linked polyacrylic acid polymers form clear gels giving the appearance of dissolution while, not wishing to be bound by theory, the clear gels are simply hydrated. Another example is an abrasive which does not dissolve at all even though it may make up the majority of the composition. An oral composition comprising an abrasive would still be deemed to be “dissolved” if only the abrasive has not dissolved. Dissolution of the oral care composition is complete when any remaining particles have a diameter of 2 mm or less.

As used herein, the term “applying” includes spraying, dusting, sprinkling, coating, surface-printing (e.g., in the shape of a desired adornment, decoration, or pattern), pouring on, injecting into the interior, dipping, or by any other suitable means, such as by use of a depositor, sifter, or powder bed.

As used herein, “conditions of intended use” means the temperature, physical, chemical, and/or mechanical conditions that an oral care composition comprising one or more filaments of the present invention is exposed to when the oral care composition is used for its designed purpose. The oral care compositions of the present invention can be administered to a mammal via the oral cavity, mouth, throat, and combinations thereof. The conditions of intended use can be the temperature, physical, chemical, and/or mechanical conditions in the oral cavity, mouth, and/or throat of a mammal.

“Triggering condition” as used herein means anything, as an act or event that serves as a stimulus and initiates or precipitates a change in the filament, such as a loss or altering of the filament's physical structure and/or a release an oral care active including dissolution, hydration, and swelling. Some triggering conditions include a suitable pH, temperature, shear rate, or water content.

“Morphology changes” as used herein with respect to a filament's morphology changing means that the filament experiences a change in its physical structure. Non-limiting examples of morphology changes for a filament of the present invention include dissolution, melting, swelling, shrinking, breaking into pieces, lengthening, shortening, peeling, splitting, shredding, imploding, twisting, and combinations thereof. The filaments of the present invention may completely or substantially lose their filament physical structure or they may have their morphology changed or they may retain or substantially retain their filament physical structure as they are exposed to conditions of intended use.

As used herein, a “web” means a sheet of continuous filaments or fibers of any nature or origin that have been formed into a web by any means, and bonded together by any means.

As used herein and as defined by European Disposables and Nonwovens Association (EDANA), “nonwoven web” means a sheet of continuous filaments or fibers of any nature or origin that have been formed into a web by any means, and bonded together by any means, with the exception of weaving or knitting. Felts obtained by wet milling are not nonwovens. In one example, a nonwoven web according to the present invention means an orderly arrangement of filaments within a structure in order to perform a function. In one example, a nonwoven web of the present invention is an arrangement comprising a plurality of two or more and/or three or more filaments that are inter-entangled or otherwise associated with one another to form a nonwoven web.

The term RDA refers to Relative Dentin Abrasion or Radioactive Dentin Abrasion as defined in FDI-ISO 11609. The term PCR refers to Pellicle Cleaning Ratio as defined in the original paper by Stookey et al. 1982 and later used by Schemehorn et al. 2011 to characterize the relative effectiveness of oral care compositions to remove a laboratory-sourced, human-like, stain from enamel chips. These experimental techniques will be described in greater detail later.

All percentages and ratios used hereinafter are by weight of total composition, unless otherwise indicated. All percentages, ratios, and levels of ingredients referred to herein are based on the actual amount of the ingredient, and do not include solvents, fillers, or other materials with which the ingredient may be combined as a commercially available product, unless otherwise indicated. All measurements referred to herein are made at 25° C. unless otherwise specified.

The composition, process and methods of the present invention can comprise, consist of, or consist essentially of, the essential elements and limitations of the invention described herein, as well as any additional or optional ingredients, components, or limitations described herein or otherwise useful in oral care compositions intended for use or consumption by mammals preferably consumption or use by humans.

An oral care composition with a “non-inferior” (NI) dose of an active agent, such as an anticaries drug, herein is defined to mean that the performance of the experimental product is at least about 60%, at least about 65%, at least about 70%, at least about 75%, at least about 80%, at least about 85%, or at least about 90% of the performance of the reference product. The reference products used herein are the United States Pharmacopeia (USP) dentifrice reference standards (USP, Rockville, Md., USA) as indicated where appropriate. The appropriate reference formulation changes based upon the experimental test product according to TABLE A, below, and may include commercial product if the USP Reference Standard is unavailable for any reason.

TABLE A Experimental Fluoride Reference Standard if Reference Standard if Source/Abrasive Preferred Standard is Preferred Standard is Combination Available Unavailable NaF/Silica USP NaF/Silica Crest ® Cavity Protection NaF/Other USP NaF/Silica SnF₂/Silica USP SnF₂/Silica Crest ® ProHealth ™ Densify ™ SnF₂/Other USP SnF₂/Silica MFP/Calcium Pyrophosphate USP MFP/Silica Colgate ® Cavity Protection MFP/Calcium Carbonate USP MFP/Calcium Carbonate MFP/Dicalcium Phosphate USP MFP/Dicalcium Dihydrate Phosphate Dihydrate MFP/Silica USP MFP/Silica MFP/Alumina USP MFP/Silica MFP/Other USP MFP/Silica Other Fluoride Salt/Any USP NaF/Silica Crest ® Cavity Protection Abrasive

To compare the performance of a given product with that of a reference product, a treatment mass of the reference product is used. For the purposes of the Examples below, the mass of the reference product that is used to determine if an oral care composition is non-inferior in its delivery of an active agent is about 1 g or about 1.25 g of reference product per dose (single brushing event). There is not a universally accepted standard for what mass of toothpaste to use as the given amount in a single brushing event. Various studies have used 1 g, 1.25 g, and 1.5 g as the treatment mass. For example, a new drug application in support of triclosan as an anti-gingivitis agent in toothpaste defined a per brushing mass of toothpaste as 1.25 g. In various embodiments, an appropriate dose of toothpaste in a brushing event for adults and children older than about 7, older than about 8, older than about 9, or older than about 10 years old may be in a range of about 1 g to about 1.5 g, about 1.1 g to about 1.4 g, about 1.2 g to about 1.3 g, or may be about 1 g or about 1.25 g.

Unit-Dose Oral Care Composition

The oral care compositions of the present invention can be unit-dose oral care compositions. A unit-dose oral care composition is an amount of the oral care composition to be administered to a patient or consumer in a single use. The unit-dose oral care composition can be a unit-dose dentifrice, a unit-dose mouth rinse, a unit-dose tooth gel, a unit-dose tooth whitening composition, or any other suitable unit-dose oral care composition capable of being retained in the oral cavity for a time sufficient to contact some or all of the dental surfaces and/or oral tissues for purposes of oral health.

The amount, in mass and/or volume, of the unit-dose oral care composition is determined based on the desired type of unit-dose oral care composition. For example, a unit-dose dentifrice can be sized to deliver the correct amount of fluoride in a single use according to local laws and regulations, such as the U.S. Food and Drug Administration (FDA) monograph, which allows formulations of 850 to 1150 ppm and/or 1500 ppm of fluoride ions. Additionally, a unit-dose dentifrice can be sized to deliver the correct amount or ratio of other ingredients, such as, for example, antimicrobial agents, abrasives, surfactants, flavors, metal ions, etc. Similarly, a unit-dose mouth rinse can be sized to deliver the correct amount of mouth rinse ingredients, such as, for example, fluoride ions, antimicrobial agents, abrasives, surfactants, flavors, metal ions, etc.

The unit-dose oral care composition can be in the form of a pouch, a droplet, a solid open cell foam, a solid closed cell foam, a fibrous composition, a paste composition, a gel composition, a tablet composition, a strip composition, a tape composition, and/or an assembly of one or more of the forms described in this paragraph.

The unit-dose oral care composition can be sized to fit a manual toothbrush, an electric toothbrush, or any other applicator designed to help contact the unit-dose oral care composition to the surfaces of the oral cavity, including, but not limited to teeth.

The unit-dose oral care composition of the present invention can be a substantially flat or flat composition in the form of a pad, strip, tape, or tablet having a thickness of from about 0.05 millimeter (mm) to about 20 mm, from about 0.05 mm to about 10 mm, from about 0.05 mm to about 5 mm, from about 0.5 mm to about 1 mm, from about 0.05 mm to about 0.5 mm, from about 0.05 mm to about 0.25 mm, or from about 0.05 mm to about 0.1 mm, as measured by the Thickness Method described hereafter. The unit-dose oral care composition can be formed into a cylindrical shape (e.g. by rolling) having a length from about 0.5 centimeter (cm) to about 10 cm, from about 1 cm to about 5 cm, or from about 1.5 cm to about 3 cm. The unit-dose oral care composition can be a rectangular prism including a cube wherein the longest sides of the rectangular prism has a length from about 5 mm to 20 mm, from about 10 mm to 15 mm, or from about 5 mm to about 10 mm, as measured by the Thickness Method described herein. If the dimensions of the dose changes, the basis weight of the dose can change. The unit-dose oral care composition can be circular or an oval wherein the diameter of the circle or the length of the longest portion of the oval is from about 5 mm to about 5 cm, 5 mm to about 100 mm, 5 mm to about 50 mm, 1 cm to about 5 cm, or 100 mm to about 1 cm.

The unit-dose oral care composition can be in the form of one or more flat sheets or pads of an adequate size to be able to be handled easily by the user. The unit-dose oral care composition can comprise one unit-dose of one or more oral care actives that can provide one or more oral care benefits and/or treat one or more oral care conditions. The unit-dose oral care composition may have a square, rectangle, oval, circular, disc shape or any other suitable shape. The unit-dose oral care composition can also be in the form of a continuous strip including delivery on a tape-like roll dispenser with individual portions dispensed via perforations and/or a cutting mechanism.

A unit-dose oral care composition can allow for the dose to include incompatible components within the same composition. Components are considered incompatible with one another, if when they are in the same solution or as non-solid mixtures, at least one of the components has a significant reduction in efficacy, stability, or bioavailability. Incompatible components can be components that chemically interact with each other to form new compounds, complexes and/or salts and/or components that will separate into discrete portions or phases of the composition to minimize unfavorable interactions.

Examples of incompatible components can include, but are not limited to, metal ion sources and silica abrasives, metal ion sources and polyphosphates, metal ion sources and pyrophosphates, calcium ion sources and fluoride ion sources, calcium ion sources and phosphate salts, calcium ion sources and pyrophosphate, oxalate ions and peroxide compounds, stannous fluoride and peroxide compounds, cationic antimicrobial agents, such as cetyl pyridinium chloride, and fluoride ion sources, acids and bases, calcium ion sources and chelants, such as EDTA, oxidizing agents and reducing agents, hydrophobic components, such as petrolatum, silicones, polybutene, and hydrophilic components, such as water and alcohols, and/or any other incompatible components, as defined above.

The unit-dose oral care compositions, as described herein, can be designed to maximize bioavailability, stability, and/or efficacy of the ingredients by minimizing reactivity between the ingredients. Minimizing reactivity between the ingredients can be accomplished by physically separating the ingredients into discrete portions of the composition or by placing one or more ingredients in the solid phase where reactivity is lower.

In the context of a pouch composition, the interior volume can be separated into multiple discrete, layered, adjacent, and/or superimposed portions that can place one or more components in each portion. For example, a fluoride ion source can be in one portion while a calcium ion source can be in another portion of the pouch composition. Additionally, a metal ion source can be in one portion while a silica abrasive or polyphosphate can be in another portion of the pouch composition.

In the context of a fibrous oral care composition, one or more reactive components can be in a one nonwoven web layer and one or more reactive components can be in another nonwoven web layer. Additionally, one or more reactive components can be in one or more nonwoven web layers and one or more reactive components can be between, on top, below, folded within, adjacent, or superimposed with the one or more nonwoven web layers, such as in a non-fibrous composition. For example, a fluoride ion source can be spun within or comingled with a first fibrous composition comprising one or more nonwoven web layers and a calcium ion source can be spun within or comingled with a second fibrous composition comprising one or more nonwoven web layers. The first and second fibrous compositions can be assembled into a single multi-ply composition using any suitable means. Additionally, a fluoride ion source can be spun within or comingled with a fibrous composition comprising one or more nonwoven web layers and a calcium ion source can be in a non-fibrous composition, as a solid composition or at least partially dissolved or at least partially dispersed in a liquid composition. The fibrous composition and the non-fibrous composition can be assembled into a multi-ply composition or the non-fibrous composition can be can be between, on top, below, folded within, adjacent, or superimposed with the fibrous composition.

In the context of a foam oral care composition, such as a flexible porous dissolvable solid structure, the reactive components can be within or comingled together within an open cell or closed cell foam, the foam compositions are described in US 2011/0027328, which is herein incorporated by reference. One or more reactive components can be in the foam composition, while one or more reactive components can be in a nonfoam composition, such as a surface resident particulate coating, which coats the surface of the solid foam composition.

The use of a unit-dose oral care composition, as described herein, allows for easy portability and the ability to better control dosing. For example, due to current restrictions on airlines regarding liquid products, a passenger is limited to carrying on only a small amount of mouth rinse or dentifrice or to packing his mouth rinse or dentifrice in his checked luggage. If the oral care composition were in unit-dose form, the passenger can pack exactly the amount needed into a carry-on without the need to worry about airline packing restrictions.

Fibrous Oral Care Composition

The oral care composition can be a fibrous oral care composition. The fibrous oral care composition can comprise a fibrous composition and/or a non-fibrous composition. The fibrous composition can comprise at least one web. The fibrous composition can comprise a nonwoven web and/or a woven web.

The fibrous composition can comprise one or more web layers. The one or web layers can comprise one or more filaments and/or fibers. The oral care composition may comprise a first web and a second web wherein the first and the second web comprise different components.

The fibrous composition can comprise any suitable oral care component. The fibrous composition can comprise any component described herein.

The web can comprise more than one filament. The web can comprise a first filament and a second filament both comprising an oral care active and the oral care active can be the same oral care active or different oral care actives. The web can comprise a first filament comprising an immediate delivery oral care active and a second filament comprising an extended delivery, a delayed delivery, and/or a targeted delivery oral care active. The web can comprise a first filament, a second filament, and a third filament, wherein each filament comprises a different oral care component.

The web or oral care composition can comprise a plurality of identical or substantially identical, from a compositional perspective, filaments according to the present invention. The web or oral care composition may comprise two or more different filaments according to the present invention. Non-limiting examples of differences in the filaments may be physical differences such as differences in diameter, length, texture, shape, rigidness, elasticity, and the like; chemical differences such as crosslinking level, solubility, melting point, glass transition temperature (Tg), web forming material, color, amount of oral care active, amount of web forming material, presence of a coating composition on the oral care composition, chemical composition of the oral care active including whether the oral care active is immediate delivery, delayed delivery, extended delivery, or targeted delivery, and the like; differences in whether the filament loses its physical structure when the filament is exposed to conditions of intended use; differences in whether the filament's morphology changes when the filament is exposed to conditions of intended use; and differences in when and where the benefit from the oral care active is experienced. In one example, two or more filaments within the oral care composition or web may comprise the same web forming material, but have different oral care actives.

The web can comprise two or more filaments wherein the filaments release the oral care actives at different rates. The different rates may be caused by the filaments being positioned at an external surface of the web.

The oral care composition can comprise a non-fibrous composition, which may or may not be greater in weight percentage, by weight of the oral care composition, than the fibrous composition. The non-fibrous composition can be between a first web and a second web. At least a portion of the non-fibrous composition can be in contact with a surface of fibrous composition. The non-fibrous composition can be placed on a single web layer and the web layer can be folded on top of the non-fibrous composition, rolled with the non-fibrous composition, placed on top of or below the fibrous composition, and/or the fibrous composition can wrap around the fibrous composition.

The non-fibrous composition can comprise any suitable oral care component. The non-fibrous composition can comprise any component described herein. The non-fibrous composition can be liquid, solid, aqueous, and/or combinations thereof.

The oral care composition of the present invention can have a basis weight of from about 10 grams per square meter (g/m²) to about 5000 g/m², from about 25 g/m² to about 2500 g/m², from about 40 g/m² to about 1500 g/m², or from about 500 g/m² to about 2000 g/m².

The fibrous oral care composition can comprise two or more components or oral care actives that are generally considered incompatible, as described herein. For example, a first web layer can comprise a fluoride ion source and a second web layer can comprise a calcium ion source. In another example, a first web layer can comprise a metal ion source, such as a stannous ion source, and a non-fibrous composition can comprise a silica abrasive or a polyphosphate.

The oral care composition or web may exhibit different regions, such as different regions of basis weight, density and/or caliper. The oral care composition or web may comprise discrete regions of filaments that differ from other parts of the web.

The oral care composition or the web may comprise one or more textured, dimpled or otherwise topographically patterned surfaces including letters, logos or figures. The textured oral care composition can result from the shape of the filament or the web, in that the outermost surface of the composition contains portions that are raised with respect to other areas of the surface. The raised portions can result from the formed shape of the oral care composition, for example the web can be formed in a dimpled or waffle pattern. The raised portions can also be the result of creping processes, imprinted coatings, embossing patterns, or the result of the physical form of the composition itself.

The web of the present invention may be pressed into a film to form the oral care composition; this can be done by applying a compressive force and/or heating the web to convert the web into a film. The film can comprise the oral care actives that were present in the filaments of the present invention. The web may be completely converted into a film or parts of the web may remain in the form of a film after partial conversion of the web into the film. The oral care composition may constitute one or more webs wherein at least one of the webs has been pressed into a film. The oral care composition may comprise two or more webs that have been pressed into a film.

The web can be rolled, compressed, cut, or stacked to form a three dimensional oral care composition. For instance, the web may be compressed into a pill or tablet, rolled into a cylinder, or compressed or stacked into a rectangular prism to form the oral care composition.

The oral care composition may constitute one or more layers of webs which are optionally bonded together via a bonding means (including heat, moisture, ultrasonic, pressure etc.). The oral care composition may constitute one or more layers of webs which are optionally bonded together via compression.

The oral care composition or nonwoven web can be perforated with holes or channels penetrating into or through the oral care composition, in total, or locally in one or more web layers. These perforations can be formed as part of making the web or oral care composition via spikes extended from the surface of an adjacent belt, drum, roller or other surface. Alternatively, these perforations can be formed after forming the web or oral care composition by a process of poking or sticking the porous solids with pins, needles or other sharp objects.

Filament

The oral care composition can comprise one or more filaments. In an embodiment, the filaments of the present invention exhibit a length of greater than about 0.1 in., in an alternate embodiment greater than about 0.2 in, in still another embodiment greater than about 0.3 in, and in another embodiment greater than about 2 in.

The filaments can have an average diameter of less than about 150 micrometers (μm), less than about 100 μm, less than about 10 μm, or less than about 1 μm with a relative standard deviation of less than 100%, less than 80%, less than 60%, or less than 50%, such as in the range of 10% to 50%, for example. As set forth herein, the significant number means at least 10% of all the filaments, in another embodiment at least 25% of all the filaments, in another embodiment at least 50% of all the filaments, in yet another embodiment at least 75% of all the filaments. The significant number may be at least 99% of all the filaments. At least 50% of all the filaments may have an average diameter less than about 10 μm. The filaments produced by the method of the present disclosure can have a significant number of filaments with an average diameter less than about 1 μm, or sub-micron filaments. In an embodiment, the oral care composition can comprise at least 25% of all the filaments with an average diameter less than about 1 μm, at least 35% of all the filaments with an average diameter less than about 1 μm, at least 50% of all the filaments with an average diameter less than about 1 μm, or at least 75% of all the filaments with an average diameter less than about 1 μm.

The filament can comprise less than 30% moisture, by weight of the filament, less than 20% moisture, by weight of the filament, less than about 10% moisture, by weight of the filament, less than about 5% moisture, by weight of the filament, less than about 3%, by weight of the filament less than about 1%, or less than about 0.1%, by weight of the filament.

The filament of the present invention can be monocomponent or multicomponent. The filament can be a bicomponent filament. The filament can be a tricomponent filament. The multicomponent filament may be in any form, such as side-by-side, core and sheath, islands-in-the-sea and the like.

The filaments of the present invention may be meltblown filaments. The filaments of the present invention may be spunbond filaments. The filaments may be hollow filaments prior to and/or after release of one or more of its active agents.

The filament may comprise an oral care active within the filament and an oral care active on an external surface of the filament, such as a coating on the filament. The oral care active on the external surface of the filament may be the same or different from the active agent present in the filament. If different, the oral care actives may be compatible or incompatible with one another.

Solid Foam Compositions

The oral care composition can be a solid foam composition, such as the flexible porous dissolve solid structure described in US 2011/0027328, which is herein incorporated by reference. The solid foam composition can be in the form of an open cell foam or a closed cell foam.

The solid foam composition can comprise any suitable oral care component. The solid foam composition can comprise any component described herein. The solid foam composition can comprise a surface resident coating composition. The surface resident coating composition can comprise any suitable oral care component or any component described herein.

Importantly, U.S. Patent Application No. 2011/0027328 does not disclose, teach, or suggest that the amount of pyrophosphate must be minimized in order to produce solid soluble foams. In fact, U.S. Patent Application No. 2011/0027328 only teaches example foam compositions with a high amount of pyrophosphate. As such, it was unexpectedly found here that pyrophosphate interfered with the foam composition formation process.

Thus, the solid foam compositions of the present invention comprise a foam forming material, one or more surfactants, a plasticizer, and wherein the solid foam composition has less than about 5%, less than about 1%, or free of an inorganic metal salt, a polyphosphate, or specifically, a pyrophosphate. The foam forming material is any suitable material that exhibits properties suitable for making a foam. Non-limiting examples of foam forming materials can include the water-soluble polymer disclosed by U.S. Patent Application No. 2011/0027328.

Web Forming Material

The web can be formed by any suitable means. The web can comprise spun fibers and/or spun filaments. The nonwoven web can be made from a web forming material or nonwoven web forming material as described in U.S. patent application Ser. No. 16/250,455, U.S. patent application Ser. No. 16/250,484, U.S. Pat. Nos. 9,139,802, 9,175,250, and/or 8,785,361, which are herein incorporated by reference in their entirety.

The web forming material can comprise any suitable material that exhibits properties suitable for making a fiber or filament. Non-limiting examples of web forming materials can include polymers, polyols, sugars, sugar alcohols, and combinations thereof. The web can comprise two or more different web forming materials. The web can comprise three or more different web forming materials. The polymer can function as a web forming material and in certain embodiments can also provide an oral health benefit.

The fibrous composition can comprise from about 1% to about 100%, from about 2% to about 50%, from about 5% to about 35%, from about 5% to about 20%, from about 1% to about 15%, or from about 5% to about 10% of a nonwoven web forming material, by weight of the fibrous composition.

The oral care composition can comprise from about 1% to about 80%, from about 1% to about 50%, from about 1% to about 25%, from about 2% to about 20%, from about 3% to about 15%, less than about 10%, or from about 5% to about 10% of a web forming material by total weight of the oral care composition.

Polymer

The oral care composition can comprise a polymer. The web forming material can comprise a polymer. The fibrous composition or the non-fibrous composition can comprise a polymer. The foam composition can comprise a polymer. Non-limiting examples of polymers can include naturally sourced polymers, synthetic polymers, and combinations thereof.

Non-limiting examples of naturally sourced polymers can include alginates, gums, protein-based polymers, starch-based polymers, native starches, modified starches, fiber polymers, other naturally sourced polymers, and combinations thereof.

Non-limiting examples of alginates can include ammonium alginate, calcium alginate, potassium alginate, propylene glycol alginate, and combinations thereof.

Non-limiting examples of gums can include acacia gum, carrageenan, tragacanth gum, guar gum, locust bean gum, xanthan gum, gellan gum, and combinations thereof.

Non-limiting examples of protein-based polymers can include whey protein isolate, soy protein isolate, egg albumin, casein, collagen, glutelin, gelatin, gluten, zein, and combinations thereof.

Non-limiting examples of starch-based polymers can include those starch-based polymers sourced from cereals, tubers, roots, legumes, fruits, and combinations thereof. Starch-based polymers can include glucose monomers joined in an a 1,4 linkage, amylose, amylopectin, and combinations thereof.

Non-limiting examples of native starches can include can include waxy or high amylase varieties of corn, pea, potato, banana, barley, wheat, rice, sago, amaranth, tapioca, arrowroot, canna, sorghum, and combinations thereof.

Non-limiting examples of modified starches can include hydroxypropyl starch, maltodextrin, high amylose starch, and combinations thereof.

Non-limiting examples of fiber polymers can include pectins, fructo-oligosaccharides, inulin, agar, beta-glucans, dextrins, lignin, celluloses, non-starch polysaccharides, reduced starch, polycarbophil, citrus fiber, and combinations thereof.

Non-limiting examples of other naturally sourced polymers can include agar, pullulan, chitin, chitosan, shellac, and combinations thereof.

Non-limiting examples of synthetic polymers can include cellulose derivatives, carbomers, polymethacrylates, other synthetic polymers, and combinations thereof.

Non-limiting examples of cellulose derivatives can include hydroxyethylmethyl cellulose, hydroxylpropylmethyl cellulose, hydroxypropyl cellulose, hydroxypropylethyl cellulose, methylcellulose, hydroxypropyl methylcellulose, and combinations thereof.

Non-limiting examples of carbomers can include carbomer 934, carbomer 934P, carbomer 940, carbomer 94, carbomer 1342, carbomer copolymers, carbomer homopolymers, carbomer interpolymers, and combinations thereof. Some carbomers are available commercially as Carbopol® 934P NF polymer, Carbopol® 971P NF polymer, and Carbopol® 974P NF polymer.

Non-limiting examples of polymethacrylates can include ammonio methacrylate copolymer, basic butylated methacrylate copolymer, methacrylic acid-methyl methacrylate copolymer (1:1), methacrylic acid-ethyl acrylate copolymer (1:1), methacrylic acid-ethyl acrylate copolymer (1:1), methacrylic acid-methyl methacrylate copolymer (1:2), polyacrylate dispersion 30%, methacrylic acid copolymer, amino methacrylate copolymer, ammonio methacrylate copolymer, ammonio methacrylate copolymer dispersion, ethyl acrylate and methyl methacrylate copolymer, and combinations thereof. Some polymethacrylates are available commercially as Eudragit® E 12.5, Eudragit® E 100, Eudragit® E PO, Eudragit® L 12.5 P, Eudragit® L 12.5, Eudragit® L 100, Eudragit® L 100-55, Eudragit® L 30 D-55, Eudragit® S 12.5 P, Eudragit® S 12.5, Eudragit® S 100, Eudragit® FS 30 D, Eudragit® RL 12.5, Eudragit® RL 100, Eudragit® RL PO, Eudragit® RL 30 D, Eudragit® RS 12.5, Eudragit® RS 100, Eudragit® RS PO, Eudragit® RS 30 D, Eudragit® NE 30 D, Eudragit® NE 40 D, Eudragit® NM 30 D, Eastacryl™ 30 D, Kollicoat® MAE 30 DP, Kollicoat® MAE 100 P, Acryl-EZE®, Acryl-EZE® 93 A, and Acryl-EZE® MP.

Non-limiting examples of other synthetic polymers can include polyvinyl alcohol, carboxyvinyl polymers, polyvinyl pyrrolidones, polyethylene oxide, polyoxyethylene, and combinations thereof.

The polymer of the present invention can be selected such that its weight average molecular weight is from about 20,000 Daltons (Da) to about 10,000,000 Da, from about 100,000 Da to about 5,000,000 Da, from about 500,000 Da to about 4,000,000 Da, or from about 1,000,000 Da to about 3,000,000 Da. The weight average molecular weight is computed by summing the weight average molecular weight of each nonwoven web forming material raw material multiplied by their respective relative weight percentages by weight of the total weight of polymers present within the filament.

The polymer can be polyvinyl alcohol with a weight average molecular weight from about 10,000 Da to about 250,000 Da, in another embodiment from about 15,000 Da to about 200,000 Da, and in another embodiment from about 20,000 Da to about 150,000 Da.

The polyvinyl alcohol can have a degree of hydrolysis of from about 60% to 100%, from about 65% to about 85%, less than 85%, from about 70% to about 80%, or from about 65% to about 95%.

The polymer can be selected from the group consisting of alginates, starch-based polymers, native starches, modified starches, and combinations thereof with a weight average molecular weight from about 1,000,000 Da to about 6,000,000 Da, from about 1,500,000 Da to about 5,000,000 Da, or from about 2,000,000 Da to about 4,000,000 Da.

The polymer can be selected from the group consisting of polyvinyl alcohol, pullulan, pectin, corn starch, modified corn starch, hydroxypropyl methylcellulose, and combinations thereof.

The fibrous composition can comprise from about 0.1% to about 50%, from about 5% to about 40%, from about 15% to about 35, from about 20% to about 30%, or from about 15% to about 30% of a polymer, by weight of the fibrous composition.

The non-fibrous composition can comprise from about 0.1% to about 50%, from about 5% to about 40%, from about 15% to about 35, from about 20% to about 30%, or from about 15% to about 30% of a polymer, by weight of the non-fibrous composition or the oral care composition.

Plasticizer

The oral care composition can comprise a plasticizer. Non-limiting examples of plasticizers can include polyols, polycarboxylic acids, polyesters, other suitable plasticizers, and combinations thereof.

Non-limiting examples of polycarboxylic acids can include citric acid, succinic acid, and combinations thereof.

Non-limiting examples of polyesters can include glycerol triacetate, diethyl phthalate, triethyl citrate, tributyl citrate, acetyl triethyl citrate, acetyl tributyl citrate, and combinations thereof.

Non-limiting examples of other suitable plasticizers of the present invention include, but are not limited to, alkyl and allyl phthalates; lactates (e.g., sodium, ammonium and potassium salts); lactic acid; soluble collagen; modified protein; monosodium L-glutamate; proteins and amino acids such as glutamic acid, aspartic acid, and lysine; hydrogen starch hydrolysates; other low molecular weight esters (e.g., esters of C2-C10 alcohols and acids); and any other plasticizer known to one skilled in the art of the food, dietary supplements, and pharmaceutical industries; and combinations thereof.

Polyol

The oral care composition can comprise a polyol. The fibrous composition or the non-fibrous composition can comprise a polyol. The web forming material can comprise a polyol. The foam forming material can comprise a polyol. A polyol is an organic compound with more than one hydroxyl functional groups. The polyol can comprise a sugar alcohol, a non-reducing sugar, a monosaccharide, a disaccharide, a polysaccharide, and/or combinations thereof.

Sugar alcohols are a class of polyols that can be obtained through the hydrogenation of sugar compounds with the formula (CHOH)_(n)H₂, preferably where n=2-6. Suitable sugar alcohols include ethylene glycol, glycerin, erythritol, threitol, arabitol, xylitol, ribitol, mannitol, sorbitol, galactitol, fucitol, iditol, inositol, volemitol, isomalt, maltitol, lactitol, maltomtriitol, maltotetraitol, and/or polyglycitol.

Non-reducing sugars are a class of saccharides that do not generate any compounds containing an aldehyde functional group. Non-reducing sugars are stable in water and do not react with weak oxidizing agents to produce sugar alcohols.

Non-limiting examples of monosaccharides can include glucose, fructose, and combinations thereof.

Non-limiting examples of disaccharides can include sucrose, maltose, lactose, high fructose corn syrup solids, trehalose, cellobiose, gentiobiose, isomaltose, kojibiose, laminaribiose, mannobiose, melibiose, nigerose, rutinose, xylobiose, lactulose and combinations thereof.

Non-limiting examples of trioses can include glyceraldehydes, dihydroxyacetone, and combinations thereof.

Non-limiting examples of tetroses can include erythrose, threose, erythrulose, and combinations thereof.

Non-limiting examples of pentoses can include arabinose, lyxose, ribose, xylose, ribulose, xylulose, and combinations thereof.

Non-limiting examples of hexoses can include allose, altrose, galactose, glucose, gulose, idose, mannose, talose, fructose, psicose, sorbose, tagatose, and combinations thereof.

Non-limiting examples of heptoses can include mannoheptulose, sedoheptulose, and combinations thereof.

Non-limiting examples of octoses can include octolose, 2-keto-3-deoxy-manno-octonate, and combinations thereof. A non-limiting example of nonose can include sialose.

The oral care composition can comprise from about 0.01% to about 50%, from about 0.1% to about 50%, from about 1% to about 40%, from about 2% to about 25%, from about 5% to about 15%, or from about 5% to about 10% of a polyol, by weight of the oral care composition.

Water

The oral care composition can comprise from about 0.01% to about 50%, by weight of the oral care composition of water. The oral care composition can comprise from about 0.01% to about 30%, from about 0.1% to about 25%, from about 0.5% to about 15%, or from about 1% to about 15% of water, by weight of the composition. The water may be added to the formulation directly and/or may come into the composition from the inclusion of other ingredients. Preferably, the water is USP water. Alternatively, the oral care composition can comprise less than about 5%, less than about 1%, less than about 0.5%, or less than about 0.01% water by weight of the total composition. The oral care composition can comprise no added water other than the minimal amount of water in commercial products incorporated into the oral care composition or the water incorporated under ambient conditions.

Abrasive

The oral care composition can comprise about 0.5% to 75% of an abrasive by weight of the oral care composition. The oral care composition can comprise from about 5% to about 60%, from about 10% to about 50%, or from about 15% to about 55%, or combinations thereof, of an abrasive by weight of the composition. The abrasive can be a calcium-containing abrasive, a silica abrasive, a carbonate abrasive, a phosphate abrasive, an alumina abrasive, other suitable abrasives, and/or combinations thereof. Some abrasives may fit into several descriptive categories, such as for example calcium carbonate, which is both a calcium-containing abrasive and a carbonate abrasive.

The calcium-containing abrasive can comprise calcium carbonate, dicalcium phosphate, tricalcium phosphate, calcium orthophosphate, calcium metaphosphate, calcium polyphosphate, calcium hydroxyapatite, and combinations thereof.

The calcium-containing abrasive can comprise calcium carbonate. The calcium-containing abrasive can be selected from the group consisting of fine ground natural chalk, ground calcium carbonate, precipitated calcium carbonate, and combinations thereof.

The carbonate abrasive can comprise sodium carbonate, sodium bicarbonate, calcium carbonate, strontium carbonate, and/or combinations thereof.

The phosphate abrasive cancomprise calcium phosphate, sodium hexametaphosphate, dicalcium phosphate, tricalcium phosphate, calcium orthophosphate, calcium metaphosphate, calcium polyphosphate, a polyphosphate, a pyrophosphate, and/or combinations thereof.

The silica abrasive can comprise fused silica, fumed silica, precipitated silica, hydrated silica, and/or combinations thereof.

The alumina abrasive can comprise polycrystalline alumina, calcined alumina, fused alumina, levigated alumina, hydrated alumina, and/or combinations thereof.

Other suitable abrasives include diatomaceous earth, barium sulfate, wollastonite, perlite, polymethylmethacrylate particles, tospearl, and combinations thereof.

The abrasive can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Fluoride Ion Source

The oral care composition may include an effective amount of an anti-caries agent. The oral care composition can comprise a fluoride ion source.

The fluoride ion source may be present in an amount sufficient to give a suitable fluoride ion concentration in the composition according to local laws and regulations, for example the anti-caries monograph at the FDA. The oral care composition can comprise from about 0.0025% to about 20%, from about 0.0025% to about 10%, from about 0.01% to about 5%, or from about 0.0025% to about 2%, by weight of the oral care composition, of the fluoride ion source.

The fluoride ion source can be at an amount suitable to obtain a theoretical fluoride concentration of from about 200 ppm to about 10000 ppm, from about 200 ppm to about 2000 ppm, from about 800 ppm to about 1500 ppm, or from about 1100 ppm to about 1400 ppm as normalized to a unit-dose oral care composition by adding water.

The fluoride ion source can comprise examples of suitable fluoride ion-yielding materials are disclosed in U.S. Pat. Nos. 3,535,421, and 3,678,154. The fluoride ion source can comprise stannous fluoride, sodium fluoride, potassium fluoride, amine fluoride, sodium monofluorophosphate, zinc fluoride, and/or combinations thereof.

The fluoride ion source and the metal ion source can be the same compound, such as for example, stannous fluoride, which can generate tin ions and fluoride ions. Additionally, the fluoride ion source and the tin ion source can be separate compounds, such as when the metal ion source is stannous chloride and the fluoride ion source is sodium monofluorophosphate or sodium fluoride.

The fluoride ion source can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Metal Ion Source

The oral care composition can comprise a metal ion source. Suitable metal ion sources include stannous ion sources, zinc ion sources, copper ion sources, silver ion sources, magnesium ion sources, iron ion sources, sodium ion sources, and manganese (Mn) ion sources, and/or combinations thereof. The metal ion source can be a soluble or a sparingly soluble compound of stannous, zinc, or copper with inorganic or organic counter ions. Examples include the fluoride, chloride, chlorofluoride, acetate, hexafluorozirconate, sulfate, tartrate, gluconate, citrate, malate, glycinate, pyrophosphate, metaphosphate, oxalate, phosphate, carbonate salts and oxides of stannous, zinc, and copper.

Stannous, zinc and copper ions are derived from the metal ion source(s) can be found in the multi-phase oral care composition an effective amount to provide an oral care benefit or other benefits. Stannous, zinc and copper ions have been found to help in the reduction of gingivitis, plaque, sensitivity, and improved breath benefits. An effective amount is defined as from at least about 500 ppm to about 20,000 ppm metal ion of the total composition, preferably from about 2,000 ppm to about 15,000 ppm. More preferably, metal ions are present in an amount from about 3,000 ppm to about 13,000 ppm and even more preferably from about 5,000 ppm to about 10,000 ppm. This is the total amount of metal ions (stannous, zinc, copper and mixtures thereof) that is present in the compositions for delivery to the tooth surface.

Other metal ion sources can include minerals and/or calcium containing compounds, which can lead to remineralization, such as, for example, sodium iodide, potassium iodide, calcium chloride, calcium lactate, calcium phosphate, hydroxyapatite, fluoroapatite, amorphous calcium phosphate, crystalline calcium phosphate, sodium bicarbonate, sodium carbonate, calcium carbonate, oxalic acid, dipotassium oxalate, monosodium monopotassium oxalate, casein phosphopeptides, and/or casein phosphopeptide coated hydroxy apatite.

The metal ion source may comprise a metal salt suitable for generating metal ions in the oral cavity. Suitable metal salts include salts of silver (Ag), magnesium (Mg), iron (Fe), sodium (Na), and manganese (Mn) salts, or combinations thereof. Preferred salts include, without limitation, gluconates, chlorates, citrates, chlorides, fluorides, and nitrates, or combinations thereof.

The oral care composition can comprise at least about 0.005%, from about 0.005% to about 10%, from about 0.01% to about 5%, from about 0.01% to about 2%, or from about 0.1% to about 1% of a metal ion source by weight of the oral care composition. The metal ion source can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Tin Ion Source

Tin ions, such as stannous ions, are used in oral care compositions to deliver benefits such as, for example, enamel care and cavity protection. Suitable tin ion sources include stannous chloride, stannous fluoride, stannous bromide, stannous iodide, stannous acetate, stannous gluconate, stannous oxalate, stannous sulfate, stannous lactate, stannous tartrate stannous carbonate, stannic chloride, stannic fluoride, stannic iodide, stannous citrate, stannic nitrate, stannous peptides, stannous proteins, and stannous phosphate, and combinations thereof. Preferably, the ion source is stannous fluoride, stannous chloride, and/or combinations thereof.

The oral care compositions of the present invention may comprise a tin ion source in the amount ranging from about 0.01% to about 5%, from about 0.05% to about 4%, from about 0.01% to about 10%, or from about 0.075% to about 3%. The tin ion source can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Zinc Ion Source

The oral care composition may comprise from about 0.01% to about 5%, from about 0.2% to about 2%, or from about 0.01% to about 10%, by weight of the oral care composition, of a zinc ion source. The zinc ion source can be selected from the group consisting of zinc citrate, zinc chloride, zinc sulfate, zinc gluconate, zinc lactate, zinc phosphate, zinc arginine, zinc fluoride, zinc iodide, zinc carbonate, and combinations thereof. More preferably, the zinc ion source is selected from zinc citrate, zinc gluconate, zinc lactate, and combinations thereof. Insoluble or sparingly soluble zinc compounds, such as zinc oxide or zinc carbonate, can be used as the zinc ion source. Zinc ion sources can be soluble zinc sources such as zinc chloride or zinc sulfate. Additionally, zinc ion sources can be those where the zinc is already combined with a suitable chelating agent in the form of a salt or other complex, such as zinc citrate, zinc gluconate, zinc lactate and zinc glycinate. Other examples of zinc ion sources are zinc citrate, zinc gluconate, zinc lactate and mixtures thereof.

When insoluble and soluble zinc compounds are both present in the zinc ion source, the soluble zinc compound can be present at least about 50%, by weight of the total zinc ion source. The oral care compositions of the present invention may optionally also include other antibacterial agents, preferably present in an amount of from about 0.035% or more, from about 0.05% to about 2%, from about 0.1% to about 1%, by weight of the oral care composition. Examples of these other anti-bacterial agents may include non-cationic anti-bacterial agents such as, for example, halogenated diphenyl ethers, phenolic compounds including phenol and its homologs, mono and poly-alkyl and aromatic halophenols, resorcinol and its derivatives, xylitol, bisphenolic compounds and halogenated salicylanilides, benzoic esters, and halogenated carbanilidies. Other useful anti-bacterial agents are enzymes, including endoglycosidase, papain, dextranase, mutanase, and combinations thereof. In another example, the other anti-bacterial agent can include triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol).

The zinc ion source can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Copper Ion Source

The oral care composition can comprise from about 0.01% to about 5%, from about 0.2% to about 2%, or from about 0.01% to about 10%, by weight of the oral care composition, of a copper ion source. The copper ion source can be selected from the group consisting of copper gluconate, copper citrate, copper fluoride, copper iodide, copper bromide, copper peptides, copper sulfate, copper arginine, copper carbonate, and combinations thereof. Copper salts can be in any possible oxidation state, including, for example, copper(I) or copper(II) salts. The copper ion source can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Calcium Ion Source

The oral care composition can comprise a calcium ion source. The calcium ion source can comprise a calcium salt, such as, for example, calcium chloride, and/or a calcium-containing abrasive, as described herein.

The calcium compound can comprise any suitable soluble calcium salt, such as for example, calcium chloride, calcium carbonate, calcium bicarbonate, calcium hydroxide, calcium lactate, calcium citrate, calcium phosphate, and combinations thereof.

The oral care composition can comprise from about 0.01% to about 10%, from about 1% to about 50%, from about 10% to about 50%, or from about 1% to about 30%, by weight of the oral care composition of a calcium ion source.

Surfactants

The oral care composition can comprise one or more surfactants. The fibrous composition can comprise one or more surfactants. The non-fibrous composition can comprise one or more surfactants. The one or more surfactants may be selected from anionic, nonionic, amphoteric, zwitterionic, cationic surfactants, or combinations thereof.

The oral care composition may include one or more surfactants at a level of from about 0.01% to about 20%, from about 1% to about 15%, from about 0.1% to about 15%, from about 5% to about 15%, or greater than about 5%%, by weight of the composition.

Suitable anionic surfactants include, for example, the water soluble salts of alkyl sulfates having from 8 to 20 carbon atoms in the alkyl radical and the water-soluble salts of sulfonated monoglycerides of fatty acids having from 8 to 20 carbon atoms. Sodium lauryl sulfate (SLS) and sodium coconut monoglyceride sulfonates are examples of anionic surfactants of this type. Other suitable anionic surfactants include sarcosinates, such as sodium lauroyl sarcosinate, taurates, sodium lauryl sulfoacetate, sodium lauroyl isethionate, sodium laureth carboxylate, and sodium dodecyl benzene sulfonate. Combinations of anionic surfactants can also be employed.

Another suitable class of anionic surfactants are alkyl phosphates. The surface active organophosphate agents can have a strong affinity for enamel surface and have sufficient surface binding propensity to desorb pellicle proteins and remain affixed to enamel surfaces. Suitable examples of organophosphate compounds include mono-, di- or triesters represented by the general structure below wherein Z₁, Z₂, or Z₃ may be identical or different with at least one being an organic moiety. Z₁, Z₂, or Z₃ can be selected from linear or branched, alkyl or alkenyl group of from 1 to 22 carbon atoms, optionally substituted by one or more phosphate groups; alkoxylated alkyl or alkenyl, (poly)saccharide, polyol or polyether group.

Some other agents include alkyl or alkenyl phosphate esters represented by the following structure:

wherein R₁ represents a linear or branched, alkyl or alkenyl group of from 6 to 22 carbon atoms, optionally substituted by one or more phosphate groups; n and m, are individually and separately, 2 to 4, and a and b, individually and separately, are 0 to 20; Z and Z may be identical or different, each represents hydrogen, alkali metal, ammonium, protonated alkyl amine or protonated functional alkylamine, such as analkanolamine, or a R—(OCH2)(OCH)— group. Examples of suitable agents include alkyl and alkyl (poly)alkoxy phosphates such as lauryl phosphate; PPGS ceteareth-10 phosphate; laureth-1 phosphate; laureth-3 phosphate; laureth-9 phosphate; trilaureth-4 phosphate; C₁₂₋₁₈ PEG 9 phosphate: and sodium dilaureth-10 phosphate. The alkyl phosphate can be polymeric. Examples of polymeric alkyl phosphates include those containing repeating alkoxy groups as the polymeric portion, in particular 3 or more ethoxy, propoxy isopropoxy or butoxy groups.

Other suitable surfactants are sarcosinates, isethionates and taurates, especially their alkali metal or ammonium salts. Examples include: lauroyl sarcosinate, myristoyl sarcosinate, palmitoyl sarcosinate, stearoyl sarcosinate oleoyl sarcosinate, or combinations thereof.

Zwitterionic or amphoteric Surfactants useful herein include derivatives of aliphatic quaternary ammonium, phosphonium, and Sulfonium compounds, in which the aliphatic radicals can be straight chain or branched, and one of the aliphatic substituents contains from 8 to 18 carbon atoms and one contains an anionic water-solubilizing group, e.g., carboxy, sulfonate, sulfate, phosphate or phosphonate. Suitable betaine surfactants are disclosed in U.S. Pat. No. 5,180,577. Typical alkyl dimethyl betaines include decyl betaine or 2-(N-decyl-N,N-dimethylammonio) acetate, coco-betaine or 2-(N-coco-N,N-dimethyl ammonio)acetate, myristyl betaine, palmityl betaine, lauryl betaine, cetyl betaine, cetyl betaine, stearyl betaine, etc. The amidobetaines can be exemplified by cocoamidoethyl betaine, cocoamidopropyl betaine (CADB), and lauramidopropyl betaine.

Cationic surfactants useful in the present invention include, for example, derivatives of quaternary ammonium compounds having one long alkyl chain containing from 8 to 18 carbon atoms such as lauryl trimethylammonium chloride; cetyl pyridinium chloride; cetyl trimethyl-ammonium bromide; cetyl pyridinium fluoride or combinations thereof.

Nonionic surfactants that can be used in the compositions of the present invention include, for example, compounds produced by the condensation of alkylene oxide groups (hydrophilic in nature) with an organic hydrophobic compound which may be aliphatic or alkylaromatic in nature. Examples of suitable nonionic surfactants can include the Pluronics® which are poloxamers, polyethylene oxide condensates of alkyl phenols, products derived from the condensation of ethylene oxide with the reaction product of propylene oxide and ethylene diamine, ethylene oxide condensates of aliphatic alcohols, long chain tertiary amine oxides, long chain tertiary phosphine oxides, long chain dialkyl sulfoxides and combinations of such materials.

The one or more surfactants can also include one or more natural surfactants. Natural surfactants can include surfactants that are derived from natural products and/or surfactants that are minimally or not processed. Natural surfactants can include hydrogenated, non-hydrogenated, or partially hydrogenated vegetable oils, olus oil, Passiflora incarnata oil, candelilla cera, coco-caprylate, caprate, dicaprylyl ether, lauryl alcohol, myristyl myristate, dicaprylyl ether, caprylic acid, caprylic ester, octyl decanoate, octyl octanoate, undecane, tridecane, decyl oleate, oleic acid decylester, cetyl palmitate, stearic acid, palmitic acid, glyceryl stearate, hydrogenated, non-hydrogenated, or partially hydrogenated vegetable glycerides, Polyglyceryl-2 dipolyhydroxystearate, cetearyl alcohol, sucrose polystearate, glycerin, octadodecanol, hydrolyzed, partially hydrolyzed, or non-hydrolyzed vegetable protein, hydrolyzed, partially hydrolyzed, or non-hydrolyzed wheat protein hydrolysate, polyglyceryl-diisostearate, glyceryl oleate, myristyl alcohol, cetyl alcohol, sodium cetearyl sulfate, cetearyl alcohol, glyceryl laurate, capric triglyceride, coco-glycerides, lectithin, dicaprylyl ether, xanthan gum, sodium coco-sulfate, ammonium lauryl sulfate, sodium cocoyl sulfate, sodium cocoyl glutamate, polyalkylglucosides, such as decyl glucoside, cetearyl glucoside, cetyl stearyl polyglucoside, coco-glucoside, and lauryl glucoside, and/or combinations thereof. Natural surfactants can include any of the Natrue ingredients marketed by BASF, such as, for example, CegeSoft®, Cetiol®, Cutina®, Dehymuls®, Emulgade®, Emulgin®, Eutanol®, Gluadin®, Lameform®, LameSoft®, Lanette®, Monomuls®, Myritol®, Plantacare®, Plantaquat®, Platasil®, Rheocare®, Sulfopon®, Texapon®, and/or combinations thereof.

The surfactant can be formed within the fibrous composition, added to the surface of the fibrous composition, and/or included in the non-fibrous composition. The surfactant formed within the fibrous composition can be at a level from about 10% to about 50%, from about 20% to about 40%, from about 25% to about 40%, or from about 30% to about 40% by weight of the fibrous composition.

The oral care composition can comprise one or more surfactants. The oral care composition can comprise an anionic surfactant, a cationic surfactant, a nonionic surfactant, and/or a zwitterionic surfactant.

The oral care composition can comprise from about 0.1% to about 10%, from about 0.1% to about 8%, from about 5% to about 8%, from about 4% to about 9%, or from about 3% to about 10% of an anionic surfactant, cationic surfactant, and/or nonionic surfactant by weight of the composition.

The oral care composition can comprise from about 0.01% to about 20%, from about 0.01% to about 10%, from about 0.1% to about 1%, from about 0.01% to about 1%, from about 0.01% to about 0.5%, or from about 0.1% to about 0.2% of a zwitterionic surfactant by weight of the composition.

PEG

The oral care composition may comprise polyethylene glycol (PEG), of various weight percentages of the composition as well as various ranges of average molecular weights. The compositions can have from about 0.1% to about 40%, from about 1% to about 35%, from about 5% to about 30%, from about 15% to about 25%, from about 1% to about 40%, from about 10% to about 30%, from about 15% to about 20%, from about 0.1% to about 30%, or from about 15% to about 30% of PEG by weight of the composition. The PEG can have a range of average molecular weight from about 100 Daltons to about 1600 Daltons, from about 200 to about 1000, from about 400 to about 800, from about 500 to about 700 Daltons, or combinations thereof. PEG is a water soluble linear polymer formed by the addition reaction of ethylene oxide to an ethylene glycol equivalent having the general formula: H—(OCH₂CH₂)_(n)—OH. One supplier of PEG is Dow Chemical Company under the brandname of CARBOWAX™.

PEG can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition. PEG included in the non-fibrous composition can be at a level from about 10% to about 50%, from about 15% to about 40%, from about 5% to about 35%, or from about 15% to about 30% by weight of the non-fibrous composition.

The PEG, when used as a solvent for the non-fibrous composition, can be anhydrous to prevent reactivity between components dispersed or dissolved within the PEG.

Polyphosphates

The oral care composition can comprise a polyphosphate source. A polyphosphate source can comprise one or more polyphosphate molecules. Polyphosphates are a class of materials obtained by the dehydration and condensation of orthophosphate to yield linear and cyclic polyphosphates of varying chain lengths. Thus, polyphosphate molecules are generally identified with an average number (n) of polyphosphate molecules, as described below. A polyphosphate is generally understood to consist of two or more phosphate molecules arranged primarily in a linear configuration, although some cyclic derivatives may be present.

Preferred polyphosphates are those having an average of two or more phosphate groups so that surface adsorption at effective concentrations produces sufficient non-bound phosphate functions, which enhance the anionic surface charge as well as hydrophilic character of the surfaces. Preferred in this invention are the linear polyphosphates having the formula: XO(XPO₃)_(n)X, wherein X is sodium, potassium, ammonium, or any other alkali metal cations and n averages from about 2 to about 21. The polyphosphate source can also include alkali earth metal polyphosphate salts, and specifically calcium polyphosphate salts, such as calcium pyrophosphate, due to the ability to separate calcium ions from other reactive components, such as fluoride ion sources.

Some examples of suitable polyphosphate molecules include, for example, pyrophosphate (n=2), tripolyphosphate (n=3), tetrapolyphosphate (n=4), sodaphos polyphosphate (n=6), hexaphos polyphosphate (n=13), benephos polyphosphate (n=14), hexametaphosphate (n=21), which is also known as Glass H. Polyphosphates can include those polyphosphate compounds manufactured by FMC Corporation, ICL Performance Products, and/or Astaris.

The oral care composition can comprise from about 0.01% to about 15%, from about 0.1% to about 0%, from about 0.5% to about 5%, from about 1 to about 20%, or about 10% or less, by weight of the oral care composition, of the polyphosphate source.

Extensional Aid

The oral care composition can comprise an extensional aid. Non-limiting examples of extensional aids can include polymers, other extensional aids, and combinations thereof.

The extensional aids can have a weight average molecular weight of at least about 500,000 Da. The weight average molecular weight of the extensional aid can be from about 500,000 to about 25,000,000, from about 800,000 to about 22,000,000, from about 1,000,000 to about 20,000,000, or from about 2,000,000 to about 15,000,000. The high molecular weight extensional aids are preferred in some embodiments of the invention due to the ability to increase extensional melt viscosity and reducing melt fracture.

The extensional aid, when used in meltblowing, can be added to the composition of the present invention in an amount effective to visibly reduce the melt fracture and capillary breakage of filaments during the spinning process such that substantially continuous filaments having relatively consistent diameter can be melt spun. Regardless of the process employed to produce filaments, the extensional aids, when used, can be present from about 0.001% to about 10%, by weight on a dry filament basis, from about 0.005 to about 5%, by weight on a dry filament basis, from about 0.01 to about 1%, by weight on a dry filament basis, or from about 0.05% to about 0.5%, by weight on a dry filament basis.

Non-limiting examples of polymers that can optionally be used as extensional aids can include alginates, carrageenans, pectin, chitin, guar gum, xanthum gum, agar, gum arabic, karaya gum, tragacanth gum, locust bean gum, alkylcellulose, hydroxyalkylcellulose, carboxyalkylcellulose, and mixtures thereof.

Nonlimiting examples of other extensional aids can include carboxyl modified polyacrylamide, polyacrylic acid, polymethacrylic acid, polyvinyl alcohol, polyvinylacetate, polyvinylpyrrolidone, polyethylene vinyl acetate, polyethyleneimine, polyamides, polyalkylene oxides including polyethylene oxide, polypropylene oxide, polyethylenepropylene oxide, and mixtures thereof.

Aesthetic Agents

The oral care composition can optionally comprise one or more aesthetic agents. The one or more aesthetic agents can be selected from the group consisting of flavors, colorants, sensates, sweeteners, salivation agents, and combinations thereof. All aesthetic agents can be present from about 0.001% to about 60%, by weight of the oral care composition, from about 0.005% to about 50%, by weight of the oral care composition, about 0.05% to about 40%, by weight of the oral care composition, or from about 0.1% to about 35%, by weight of the oral care composition.

Aesthetic agents can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Flavors

The oral care composition can optionally include one or more flavors. Non-limiting examples of flavors that can be used in the present invention can include natural flavoring agents, artificial flavoring agents, artificial extracts, natural extracts and combination thereof. Non-limiting examples of flavors can include vanilla, honey, lemon, lemon honey, cherry vanilla, peach, honey ginger, chamomile, cherry, cherry cream, mint, vanilla mint, dark berry, black berry, raspberry, peppermint, spearmint, honey peach, acai berry, cranberry, honey cranberry, tropical fruit, dragon fruit, wolf berry, red stem mint, pomegranate, black current, strawberry, lemon, lime, peach ginger, orange, orange cream, cream sickle, apricot, anethole, ginger, jack fruit, star fruit, blueberry, fruit punch, lemon grass, chamomile lemon grass, lavender, banana, strawberry banana, grape, blue raspberry, lemon lime, coffee, espresso, cappuccino, honey, wintergreen mint, bubble gum, tart honey lemon, sour lemon, green apple, boysenberry, rhubarb, strawberry rhubarb, persimmon, green tea, black tea, red tea, white tea, honey lime, cherry lime, apple, tangerine, grapefruit, kiwi, pear, vanillin, ethyl vanillin, maltol, ethyl-maltol, pumpkin, carrot cake, white chocolate raspberry, chocolate, white chocolate, milk chocolate, dark chocolate, chocolate marshmallow, apple pie, cinnamon, hazelnut, almond, cream, crème brûlée, caramel, caramel nut, butter, butter toffee, caramel toffee, aloe vera, whiskey, rum, cocoa, licorice, pineapple, guava, melon, watermelon, elder berry, mouth cooler, raspberries and cream, peach mango, tropical, cool berry, lemon ice, nectar, spicy nectar, tropical mango, apple butter, peanut butter, tangerine, tangerine lime, marshmallow, cotton candy, apple cider, orange chocolate, adipic acid, citral, denatonium benzoate, ethyl acetate, ethyl lactate, ethyl maltol, ethylcellulose, fumaric acid, leucine, malic acid, menthol, methionine, monosodium glutamate, sodium acetate, sodium lactate, tartaric acid, thymol, and combinations thereof.

Flavors can be protected in an encapsulate or as a flavor crystal. The encapsulated flavor can have a controlled or delayed release once the encapsulated flavor reaches the oral cavity. The encapsulate can comprise a shell and a core. The flavor can be in the core of the encapsulate. The flavor can be encapsulated by any suitable means, such as spray drying or extrusion. Encapsulated flavors can be added to the surface of the fibrous composition, formed within the fibrous composition, or included in the non-fibrous composition.

Flavors can be present from about 0.05% to about 25%, by weight of the oral care composition, from about 0.01% to about 15%, by weight of the oral care composition, from about 0.2% to about 10%, by weight of the oral care composition, or from about 0.1% to about 5%, by weight of the oral care composition.

Flavors can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Colorants

The oral care composition can optionally include one or more colorants. The colorants can provide a visual signal when the oral care composition is exposed to conditions of intended use. Non-limiting examples colorants that may be used in the present invention include FD&C blue #1, FD&C blue #2, D&C blue #4, D&C blue #9, FD&C green #3, D&C green #5, D&C green #6, D&C green #8, D&C orange #4, D&C orange #5, D&C orange #10, D&C orange #11, FD&C red #3, FD&C red #4, D&C red #6, D&C red #7, D&C red #17, D&C red #21, D&C red #22, D&C red #27, D&C red #28, D&C red #30, D&C red #31, D&C red #33, D&C red #34, D&C red #36, D&C red #39, FD&C red #40, D&C violet #2, FD&C yellow #5, FD&C yellow #6, D&C yellow #7, Ext. D&C yellow #7, D&C yellow #8, D&C yellow #10, D&C yellow #11, and combinations thereof. Colorants can be present from about 0.05% to about 2%, by weight of the oral care composition, from about 0.01% to about 2%, by weight of the oral care composition, or from about 0.02% to about 1.5%, by weight of the oral care composition.

Colorants can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Sensates

The oral care composition can optionally include one or more sensates. Non-limiting examples of sensates can include cooling sensates, warming sensates, tingling sensates, and combinations thereof. Sensates are useful to deliver signals to the user.

Non-limiting examples of cooling sensates can include WS-23 (2-Isopropyl-N,2,3-trimethylbutyramide), WS-3 (N-Ethyl-p-menthane-3-carboxamide), WS-30 (1-glyceryl-p-mentane-3-carboxylate), WS-4 (ethyleneglycol-p-methane-3-carboxylate), WS-14 (N-t-butyl-p-menthane-3-carboxamide), WS-12 (N-(4-,ethoxyphenyl)-p-menthane-3-carboxamide), WS-5 (Ethyl-3-(p-menthane-3-carboxamido)acetate, Menthone glycerol ketal (sold as Frescolat® MGA by Haarmann & Reimer), (-)-Menthyl lactate (sold as Frescolat® ML by Haarmann & Reimer), (-)-Menthoxypropane-1,2-diol (sold as Coolant Agent 10 by Takasago International), 3-(1-menthoxy)propane-1,2-diol, 3-(1-Menthoxy)-2-methylpropane-1,2-diol, (-)-Isopulegol is sold under the name “Coolact P®” by Takasago International., cis & trans p-Menthane-3,8-diols (PMD38)—Takasago International, Questice® (menthyl pyrrolidone carboxylate), (1R,3R,4S)-3-menthyl-3,6-dioxaheptanoate-Firmenich, (1R,2S,5R)-3-menthyl methoxy acetate—Firmenich, (1R,2S,5R)-3-menthyl 3,6,9-trioxadecanoate—Firmenich, (1R,2S,5R)-menthyl 11-hydroxy-3,6,9-trioxaundecanoate—Firmenich, (1R,2S,5R)-3-menthyl (2-hydroxyethoxy)acetate—Firmenich, Cubebol—Firmenich, Icilin also known as AG-3-5, chemical name 1-[2-hydroxyphenyl]-4-[2-nitrophenyl-]-1,2,3,6-tetrahydropyrimidine-2-one), 4-methyl-3-(1-pyrrolidinyl)-2[5H]-furanone, Frescolat ML—menthyl lactate, Frescolat MGA—menthane glycerin acetal, Peppermint oil, Givaudan 180, L-Monomenthyl succinate, L-monomenthyl glutarate, 3-1-menthoxypropane-1,2-diol—(Coolact 10), 2-1-menthoxyethanol (Cooltact 5), TK10 Coolact (3-1-Menthoxy propane-1,2-diol), Evercool 180 (N-p-benzeneacetonitrile-menthane carboxamide), and combinations thereof. Cooling sensates can be present from about 0.005% to about 10%, by weight of the oral care composition, from about 0.05% to about 7%, by weight of the oral care composition, or from about 0.01% to about 5%, by weight of the oral care composition.

Non-limiting examples of warming sensates can include TK 1000, TK 1 MM, Heatenol—Sensient Flavors, Optaheat—Symrise Flavors, Cinnamon, Polyethylene glycol, Capsicum, Capsaicin, Curry, FSI Flavors, Isobutavan, Ethanol, Glycerin, Nonivamide 60162807, Hotact VEE, Hotact 1MM, piperine, optaheat 295 832, optaheat 204 656, optaheat 200 349, and combinations thereof. Warming sensates can be present from about 0.005% to about 60%, by weight on a dry filament basis, from about 0.05% to about 50%, by weight on a dry filament basis, or from about 0.01% to about 40%, by weight on a dry filament basis. Warming sensates can be present from about 0.005% to about 10%, by weight of the oral care composition, from about 0.05% to about 7%, by weight of the oral care composition, or from about 0.01% to about 5%, by weight of the oral care composition. Non-limiting examples of tingling sensates can include sichuan pepper, hydroxy alpha sanshool, citric acid, Jambu extracts, spilanthol, and combinations thereof. Tingling sensates can be present from about 0.005% to about 10%, by weight on a dry filament basis or the oral care composition, from about 0.01% to about 7%, by weight on a dry filament basis or the oral care composition, or from about 0.015% to about 6%, by weight on a dry filament basis or the oral care composition.

Sensates can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Sweeteners

The oral care composition can optionally include one or more sweeteners. Sweeteners can be natural or artificial. Non-limiting examples of sweeteners can include nutritive sweeteners, sugar alcohols, synthetic sweeteners, high intensity natural sweeteners, and combinations thereof. All sweeteners can be present from about 0.05% to about 60%, by weight of the oral care composition, from about 0.1% to about 50%, by weight of the oral care composition, or from about 1% to about 10%, by weight of the oral care composition.

Non-limiting examples of nutritive sweeteners can include sucrose, dextrose, glucose, fructose, lactose, tagatose, maltose, trehalose, and combinations thereof. Nutritive sweeteners can be present from about 0.1% to about 60%, by weight of the oral care composition, from about 1% to about 50%, by weight of the oral care composition, or from about 0.1% to about 10%, by weight of the oral care composition.

Non-limiting examples of sugar alcohols can include xylitol, sorbitol, mannitol, maltitol, lactitol, isomalt, erythritol, and combinations thereof. Sugar alcohols can be present from about 0.1% to about 60%, by weight of the oral care composition, from about 0.11% to about 50%, by weight of the oral care composition, or from about 0.1% to about 10%, by weight of the oral care composition.

Non-limiting examples of synthetic sweeteners can include aspartame, acesulfame potassium, alitame, sodium saccharin, sucralose, neotame, cyclamate, and combinations thereof. Synthetic sweeteners can be present from about 0.05% to about 10% by weight of the oral care composition, from about 0.1% to about 5%, by weight of the oral care composition, or from about 0.25% to about 4%, by weight of the oral care composition.

Non-limiting examples of high intensity natural sweeteners can include neohesperidin dihydrochalcone, stevioside, rebaudioside A, rebaudioside C, dulcoside, monoammonium glycrrhizinate, thaumatin, and combinations thereof. High intensity natural sweeteners can be present from about 0.05% to about 10% by weight of the oral care composition, from about 0.1% to about 5%, by weight of the oral care composition, or from about 0.25% to about 4%, by weight of the oral care composition.

Sweeteners can be formed within the nonwoven web, added to the surface of the nonwoven web, or included in the non-fibrous composition.

Salivation Agents

The oral care composition can optionally include one or more salivation agents. Non-limiting examples of salivation agents include formula (I):

wherein R₁ represents C1-C2 n-alkyl; R₂ is 2-methyl-1-propyl and R₃ is hydrogen, or R₂ and R₃ taken together is a moiety (designated by the dashed lines) having the formula —(CH₂)_(n)— wherein n is 4 or 5, and combinations thereof.

The salivating agent can comprise a material wherein R₂ is 2-methyl-1-propyl and R₃ is hydrogen or the salivating agent can comprise a material wherein R₁ is C1 n-alkyl, R₂ is 2-methyl-1-propyl and R₃ is hydrogen. The salivating agent can comprise trans-pellitorin, a chemical having a structure according to formula (II):

The salivation agent can include sodium bicarbonate, sodium chloride, trans pelitorin, pilocarpine, citrate, and combinations thereof. Salivation agents can be present from about 1% to about 60%, from about 1% to about 50%, or from about 1% to about 40%, by weight of the oral care composition. Additionally, salivation agents can be present from about 0.005% to about 10%, by weight of the oral care composition, from about 0.01% to about 7%, by weight of the oral care composition, or from about 0.015% to about 6%, by weight of the oral care composition.

Salivation agents can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Thickening Agent

The oral care compositions herein may include one or more thickening agents. A thickening agent may be used in an amount from about 0.01% to about 15%, or from about 0.1% to about 10%, or from about 0.1% to about 5%, by weight of the oral care composition. Non-limiting examples may include those described in US 2008/0081023 A1 at paragraphs 134 to 137, and the references cited therein.

The oral care composition can comprise a linear sulfated polysaccharide as a thickening agent. Carrageenans or carrageenins are one example of a linear sulfated polysaccharide. Generally, carrageenans can vary based upon the degree of sulfation that includes: Kappa-carrageenan, Iota-carrageenan, and Lambda-carrageenan. Combinations of carrageenans can be used. The oral care composition can contain from about 0.1% to about 3%, of a linear sulfated polysaccharides by weight of the oral care composition, from about 0.5% to about 2%, from about 0.6% to about 1.8%, or combinations thereof.

The oral care composition can comprise a silica agent, preferably a thickening silica obtained from sodium silicate solution by destabilizing with acid as to yield very fine particles. One commercially available example is ZEODENT® branded silicas from Huber Engineered Materials (e.g., ZEODENT® 103, 124, 113 115, 163, 165, 167). The oral care composition can include from about 0.5% to about 5% by weight of the oral care composition of a silica agent, preferably from about 1% to about 4%, alternatively from about 1.5% to about 3.5%, alternatively from about 2% to about 3%, alternatively from about 2% to about 5% alternatively from about 1% to 3%, alternatively combinations thereof.

The thickening agent can comprise a carboxymethyl cellulose (“CMC”). CMC is prepared from cellulose by treatment with alkali and monochloro-acetic acid or its sodium salt. Different varieties are commercially characterized by viscosity. One commercially available example is Aqualon™ branded CMC from Ashland Special Ingredients (e.g., Aqualon™ 7H₃SF; Aqualon™ 9M3SF Aqualon™ TM9A; Aqualon™ TM12A). The thickening agent can contain from about 0.1% to about 3% of a CMC by weight of the oral care composition, preferably from about 0.5% to about 2%, alternatively from about 0.6% to about 1.8%, alternatively combinations thereof.

Thickening agents can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Chelants

The oral care compositions of the present invention can comprise one or more chelants, also known as chelating agents. The term “chelant”, as used herein means a bi- or multidentate ligand having at least two groups capable of binding to metal ions and preferably other divalent or polyvalent metal ions and which, at least as part of a chelant mixture, is capable of solubilizing tin ions or other optional metal ions within the oral care composition. Groups capable of binding to metal ions include carboxyl, hydroxl, and amine groups.

Suitable chelants herein include C₂-C₆ dicarboxylic and tricarboxylic acids, such as succinic acid, malic acid, tartaric acid and citric acid; C₃-C₆ monocarboxylic acids substituted with hydroxyl, such as gluconic acid; picolinic acid; amino acids such as glycine; salts thereof and mixtures thereof. The chelants can also be a polymer or copolymer in which the chelating ligands are on the same or adjacent monomer

Preferred chelant polymers are polyacids selected from the group consisting of a homopolymer of a monomer, a co-polymer of two or more different monomers, and a combination thereof wherein the monomer or at least one of the two or more different monomers is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, glutaconic acid, aconitic acid, citraconic acid, mesaconic acid, fumaric acid and tiglic acid. Particularly preferred is a methylvinylether/maleic acid (PVM/MA) copolymer. Other useful chelants include polyphosphates, as discussed herein.

Preferred organic acid chelants herein comprise citrate, malate, tatirate, gluconate, succinate, lactate, malonate, maleate, and mixtures thereof, whether added in their free acid or salt forms.

The oral care compositions of the present invention can have low levels of chelants because metals ions can require less stabilization if introduced in a fibrous composition, a non-fibrous composition, or physically separated from other reactive components of the oral care composition, which can be added in a separate web layer or in the non-fibrous composition. The oral care composition can have less than about 5%, less than about 1%, less than about 0.5%, less than 0.1%, less than about 0.01%, or 0% of chelants, by weight of the oral care composition. Chelants can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Whitening Agents

The oral care composition may further comprise from about 0.1% to about 10%, from about 0.2% to about 5%, from about 1% to about 5%, or from about 1% to about 15%, by weight of the total oral care composition of a whitening agent. The whitening agent can be a compound suitable for whitening at least one tooth in the oral cavity. The whitening agent may include peroxides, metal chlorites, perborates, percarbonates, peroxyacids, persulfates, and combinations thereof. Suitable peroxides include solid peroxides, urea peroxide, calcium peroxide, benzoyl peroxide, sodium peroxide, barium peroxide, inorganic peroxides, hydroperoxides, organic peroxides, and mixtures thereof. Suitable metal chlorites include calcium chlorite, barium chlorite, magnesium chlorite, lithium chlorite, sodium chlorite, and potassium chlorite. Other suitable whitening agents include sodium persulfate, potassium persulfate, peroxydone, 6-phthalimido peroxy hexanoic acid, Pthalamidoperoxycaproic acid, or mixtures thereof.

Whitening agents can be reactive with other components of oral care compositions, thus, can be separated from other components using the assembly design described herein. Whitening agents can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Bioactive Materials

The oral care composition can also include bioactive materials suitable for the remineralization of a tooth. Suitable bioactive materials include bioactive glasses, Novamin™, Recaldent™ hydroxyapatite, amino acids, such as, for example, arginine, citrulline, glycine, lysine, or histidine, or combinations thereof. Other suitable bioactive materials include any calcium phosphate compound. Other suitable bioactive materials include compounds comprising a calcium source and a phosphate source.

Bioactive glasses are comprising calcium and/or phosphate which can be present in a proportion that is similar to hydroxyapatite. These glasses can bond to the tissue and are biocompatible. Bioactive glasses can include a phosphopeptide, a calcium source, phosphate source, a silica source, a sodium source, and/or combinations thereof.

The oral care composition can comprise from about 0.01% to about 20%, from about 0.1% to about 10%, or from about 1% to about 10% of a bioactive material by weight of the oral care composition.

Bioactive materials can be formed within the fibrous composition, added to the surface of the fibrous composition, or included in the non-fibrous composition.

Non-Fibrous Compositions

The components described herein can optionally be present, at least partially, as a non-fibrous composition. The non-fibrous composition can be between two or more web layers, folded inside at least one web layer, rolled inside at least web layer, or wrapped in at least one web layer. At least a portion of the non-fibrous composition can contact the surface of a fibrous composition. The non-fibrous composition can be liquid, solid, aqueous, and/or combinations thereof.

The non-fibrous composition may comprise an oral care active, aesthetic agent, abrasive, fluoride ion source, web forming material, metal ion source, polyphosphate, chelant, anti-calculus agent, thickening agent, polymer, surfactant, bioactive material and/or combinations thereof.

The non-fibrous composition can be from about 10% to about 90%, from about 20% to about 85%, from about 30% to about 80%, from about 40% to about 75%, from about 50% to about 80%, from about 50% to about 90%, or from about 60% to about 80% by weight of the oral care composition.

The density of the non-fibrous composition can be from about 0.05 g/cm³ to about 5 g/cm³, from about 0.75 g/cm³ to about 1.9 g/cm³, from about 1 g/cm³ to about 1.75 g/cm³, or from about 1.4 g/cm³ to about 1.8 g/cm³.

Coating Composition

The components described herein can optionally be present, at least partially, as a coating composition. The coating composition can be applied to the fibrous composition, web, or the oral care composition. The coating composition at least partially covers or covers an outer surface of the fibrous composition or the web. The coating composition can cover an outer surface of the oral care composition putting the coating composition in position to immediately contact the target surface (e.g. saliva in the mouth) during use for the release of the oral care active(s) and/or aesthetic agent(s).

The coating composition of the present invention may comprise one or more oral care actives as defined herein. The coating composition of the present invention may comprise one or more aesthetic agents as defined herein.

The fibrous composition, web, or oral care composition may comprise one or more oral care actives which can be the same or different from the oral care active present in the coating composition.

The fibrous composition, web, or oral care composition can comprise a delayed delivery, an extended delivery oral care active, and/or a targeted delivery oral care active and the coating composition comprises an immediate delivery oral care active. The fibrous composition, web, or oral care composition can comprise one or more aesthetic agents which can be the same or different from the aesthetic agent in the coating composition.

The coating composition can also be entrapped within the fibrous composition or the web. Thus, the particles of the coating composition can fit within the void between the fibers or filaments when formed into a web using any suitable means.

Releasable Components

Oral care actives, aesthetic agents, or other components in the oral care composition can be designed to be releasable upon a suitable triggering condition. The releasable components can be releasable on the same or a different triggering condition. For example, a flavor encapsulate can be releasable upon a shear rate associated with a user brushing at least one tooth. A fluoride ion source can be releasable upon contact with water. This can allow for oral care actives or aesthetic agents to be released at a designable time. For example, a flavor can be released 1 seconds after brushing while a colorant can be releasable after a user has brushed for two minutes to indicate a suitable brushing time has passed. Aesthetic agents or oral care actives can be delivered sequentially or simultaneous with other aesthetic agents or oral care actives.

Graphics

Graphics can be printed directly on the oral care compositions. Suitable graphics include graphics to match flavors, graphics of sports teams logos or names, graphics to match directions for use, such as use at a particular time of day, after consuming a certain food or drink, or the type of brush to use, marketing material, colors, designs, logos, graphics depicting fictional and nonfictional characters, graphics tied to a consumer benefit, flags, phrases, catch phrases, motivational quotes, branding material, company information, ingredient lists, animals, or other suitable graphics to convey information directly on the oral care compositions. Graphics can be printed on each side of the oral care composition. Graphics can be the same or different on each side of the oral care composition.

Dissolution Time

The oral care compositions of the present invention can be described by their dissolution times. The oral care compositions of the present invention dissolve much quicker than a comparable paste dentifrice. Oral care compositions comprising a fibrous composition of the present invention can have a total dissolution time according to the dissolution method, as described herein, of less about 1000 seconds, less than about 750 seconds, less than about 500 seconds, less than about 250 seconds, from about 50 seconds to about 250 seconds, or from about 50 seconds to about 500 seconds per dose of oral care composition. Foam compositions of the present invention can have a total dissolution time according to the dissolution method described herein of less than about 50 seconds, less than about 30 seconds, or less than about 20 seconds per dose of the foam composition. Comparable dentifrice paste formulations have dissolution times of greater than 1000 seconds which is not suitable for a unit-dose oral care composition that needs to dissolve upon contact with moisture in the oral cavity.

Fluoride Uptake

The oral care compositions, as described herein, can be described according its average fluoride uptake by HAP dissolution. The oral care compositions of the present invention have a higher average F uptake despite also comprising components that are typically avoided or carefully avoided due to reactivity with fluoride ions. For example, the oral care compositions can have an average fluoride uptake of at least 1000 ppm, at least 1500 ppm, or at least 2000 ppm despite comprising a fluoride ion source and a calcium ion source, which can react to form precipitated calcium fluoride prior to use by a consumer. The oral care compositions, as described herein, physically separate the fluoride ion source from the calcium ion source in a different nonwoven web layers, in separate portions, in separate compositions of the oral care compositions, or in a soluble solid phase. The physical separation of these components have been previously difficult to achieve. Unit-dose oral care compositions, such as pouches, solid foams, or soluble fibrous compositions, provide the chassis that can physically separate fluoride ions from calcium ions during storage, but also allows them to be combinable upon dissolution and/or disintegration in the oral cavity.

Tin Ion Uptake

The oral care compositions, as described herein, can be described according its average tin ion uptake by HAP dissolution. The oral care compositions of the present invention have a higher average Sn uptake despite also comprising components that are typically avoided or carefully formulated due to reactivity with tin ions. For example, the oral care compositions can have an average tin ion uptake of at least 5000 ppm, at least 10000 ppm, or at least 20000 ppm despite comprising a tin ion source and a polyphosphate, silica abrasive, etc., which can react to form tin complexes that low the tin ion availability prior to use by a consumer. The oral care compositions, as described herein, physically separate the metal ion source from polyphosphates, silica abrasives, or other chelants in a different nonwoven web layers, in separate portions, in separate compositions of the oral care compositions, or in a soluble solid phase. The physical separation of these components have been previously difficult to achieve. Unit-dose oral care compositions, such as pouches, solid foams, or soluble fibrous compositions, provide the chassis that can physically separate metal ions from other reactive components during storage, but also allows them to be combinable upon dissolution and/or disintegration in the oral cavity.

Morphology

The oral care composition, as described herein, can be described by its morphology, which is unique relative to other oral care compositions, such as dentifrice pastes and/or mouth rinses. For example, the unit-dose oral care composition comprising a fibrous composition can be a nonwoven web of fiber and/or filaments. The unit-dose oral care composition comprising a solid soluble foam composition can have voids within a solid foam network connected by struts. The solid soluble foam compositions can have a mean void volume percentage, or the ratio between void-space to the total space occupied by the foam, of at least about 75%, at least about 85% or at least about 88%. In contrast, the fibrous compositions can have a mean void volume of from about 15% to about 75%, from about 15% to about 70%, from about 30% to about 75%, or from about 35% to about 70%. Dentifrice pastes and/or mouth rinses would have mean void volume percentages of less than 15% prior to use by a consumer.

Solid soluble foam compositions can have an average pore size of greater than about 0.1 mm, greater than about 0.2 mm, or greater than about 0.3 mm. In contrast, the fibrous compositions can have an average pore size of from about 0.001 mm to about 0.1 mm, from about 0.01 mm to about 0.05 mm, or from about 0.01 mm to about 0.1 mm. Dentifrice pastes and/or mouth rinses would not be expected to have pores until use by a consumer since they are liquids and/or pastes.

Solid soluble foam compositions can have a surface area of from about 50 mm-1 to about 150 mm-1, from about 75 mm-1 to about 160 mm-1, or from about 100 mm-1 to about 150 mm-1. In contrast, the surface of fibrous compositions can be at least about 150 mm-1, at least about 200 mm-1, or at least about 250 mm-1.

EXAMPLES

The following examples further describe and demonstrate embodiments within the scope of the present invention. The examples are given solely for the purpose of illustration and are not to be construed as limitations of the present invention, as many variations thereof are possible without departing from the spirit and scope of the invention. All exemplified amounts are concentrations by weight of the total composition, i.e., wt/wt percentages, unless otherwise specified.

Unit-Dose Oral Care Compositions

Fibrous unit-dose oral care compositions were assembled from a fibrous composition and a non-fibrous composition. The fibrous composition, based on TABLE 1, was made by first adding USP water to a batch mixing tank. The target amount of water is 60 wt % including the water introduced with any aqueous components, thus, the actual amount of the components added varies based on the batch size and the target composition. Next, the target amount of xylitol was added to the batch mixing tank while mixing at 60 rpm. The target amount of polyvinyl alcohol was added to the batch mixing tank. The batch mixing tank was heated to 80° C. The mixture was heated and stirred for 2 hours at 80° C. and 120 rpm.

The target amount of sodium lauryl sulfate and cocamidopropyl betaine were added in succession as aqueous solutions. Next, sucralose was then added to the mixture. Finally, the fluoride ion source was then added, if desired. The fibrous composition melt was allowed to degas over night while being stirred at 70° C.

The fibrous composition melt was allowed to cool to 40° C., and the fibrous composition melt was spun into filaments and/or fibers. The fibrous composition melt was transferred from the batch mixing tank to the fiber spinning die. Fibers and/or filaments were extruded via a Biax-fiberfilm multi-row capillary die at 60° C. The fibers and/or filaments were attenuated and dried with hot air to have less than 5% moisture. The fibers and/or filaments were collected on a belt as the fibrous composition.

The non-fibrous composition was synthesized by adding the components listed in TABLE 1 to PEG-12 with mechanical mixing to create a slurry

The fibrous unit-dose compositions were assembled by placing a first strip of the fibrous composition onto a die plate. Cavities in the fibrous composition were made by applying force within each die well. The non-fibrous composition was applied to the interior of the cavity with a dropper. A second strip of fibrous composition was placed on top of the die plate. Pressure was applied to cut and bond the edges of the first and second fibrous composition layers. The dose was removed the die cutter and the process was repeated for each dose.

TABLE 1 Unit-dose oral care compositions Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Location Ingredient (% wt) (% wt) (% wt) (% wt) (% wt) Fibrous Water 1.60 1.60 1.49 1.55 2.22 Compo- SLS¹ 19.16 19.16 21.13 21.97 27.64 sition Cocamido- 4.81 4.81 0.63 0.66 0.81 propyl Betaine Polyvinyl 16.42 16.42 12.42 12.92 23.57 Alcohol² Sodium 2.74 2.74 2.49 2.59 4.29 Saccharin Xylitol 0.96 5.61 11.68 12.15 20.36 Sodium 4.65 — — — — Gluconate SnF₂ 3.15 3.15 — — — NaF — — — — 2.31 Sucralose — — 0.15 0.16 0.27 Non- Flavor 11.81 11.81 10.90 11.33 16.19 fibrous Sodium 34.72 34.72 32.05 33.33 — Compo- Hexameta- sition phosphate SnF₂ — — 2.91 3.03 — Sodium — — 4.18 — — Gluconate CaCl₂ — — — — 1.90 ¹Powder ²Mixture of PVA403 and PVA420H

HAP Dissolution

The HAP dissolution method was designed to test the acid protection of a chosen test dentifrice. After treating hydroxyapatite powder (HAP) with test dentifrice slurries, the HAP is added to an acidic media and the change in pH is an indicator of the degree of surface adsorption. The smaller the pH rise, the better the surface protection.

Dentifrice slurries (1:3 paste:water) were prepared for the comparative treatment compositions listed in TABLE 2. Specifically, 10 g of dentifrice paste was combined with 30 g of deionized water in a 50 mL container with a stir bar. The container was placed on a stir plate to mix until the two components were mixed. The paste slurries were centrifuged at 15,000 rpm for 15 min.

For each treatment, including for the water control, 0.300 g of hydroxyapatite powder (HAP) was placed into a 50 mL round bottom centrifuge tube. For treatment with a dentifrice paste, 24 mL of the prepared dentifrice slurry was added to the HAP. For treatment with Examples 1-4, 24 mL of water and 8 unit-doses of Examples 1-4 were added to the HAP. Each treated HAP sample was immediately vortex mixed at 2500 rpm for 2 minutes. All samples were then centrifuged at 15,000 rpm for 15 minutes. The liquid phase was decanted out of the centrifuge tube, which left a HAP pellet. The remaining HAP pellet was rinsed three times by adding deionized water, vortex mixing at 2500 rpm for 1 minute, centrifuging at 15,000 rpm for 15 minutes, and the liquid phase was decanted out of the centrifuge tube. The treated HAP pellet was dried in a 55° C. oven overnight.

Samples of HAP were then analyzed for fluoride ion uptake. 0.100 g of the dried and treated HAP was placed in a 50 mL Falco tube. 25 mL of 0.5M perchloric acid was added to each Falco tube and each sample was vortex mixed for 1 minute at 2500 rpm. A 1 mL aliquot of each digested sample was added to a plastic vial. 1 mL of pH adjusted TISAB II (6:1 TISAB II: 2N NaOH) was added to each sample. The fluoride content was measured via a fluoride ion selective electrode (Beckman Coulter, Inc., Pasadena, Calif., Cat. No. A51712).

Samples of HAP were analyzed for ApH. 25 mL of 10 mM citric acid (1.9212 g of citric acid in 1 L of deionized water) was added to a 50 mL beaker with a stir bar. The beaker was placed on a stir plate (Metrohm, Herisau, Switerland, Model No. 728) and turned on. The Titrano pH electrode (Metrohm, Herisau, Switzerland, Model No. 719S) was placed in the stirring beaker with citric acid. After equilibration of the citric acid solution (until pH has a minimum change of 2.5±0.001 pH within second), 50 mg of the dried HAP powder was added to the citric acid solution. The pH was recorded at 5 min and 10 min. The % efficacy was determined by Formula I, below.

$\begin{matrix} {{\%{Efficacy}{{vs}.{CCP}}} = \frac{{{Average}\Delta{pH}{CCP}} - {{Average}{\Delta pH}{Treatment}}}{{Average}{\Delta pH}{CCP}}} & {{Formula}I} \end{matrix}$

Samples of HAP were analyzed for tin ion uptake by mixing 0.100 g of the dried and treated HAP with 25 mL of 90:10 (HNO₃:HBF₃) digestor. An aliquot of the digested HAP powder was analyzed for total tin ion uptake by ICP-MS by comparison to the values of a curve of standard concentrations of tin ions.

TABLE 2 Average F and Sn Uptake by HAP dissolution % Average Sn Average F Efficacy Uptake Uptake Avg vs. Treatment (ppm) (ppm) ΔpH CCP Water <500 136 1.36 −46.2 Crest ® Cavity Protection <500 2286 0.93 0.00 (CCP) Crest ® Pro-Health ™ 4987 1038 0.77 17.2 Advanced (CPH) Example 1 34100 2182 0.49 47.3 Example 2 25800 2401 0.59 36.6 Example 3 33200 1832 0.65 30.1 Example 4 32800 1773 0.63 32.3 Example 5 <500 5765 0.78 16.1

TABLE 2 shows the average Sn and F uptake by the HAP dissolution described herein. The average Sn uptake of the HAP sample treated with water or CCP resulted in an average Sn uptake of <500 ppm. This was an expected result as neither water nor CCP contained added tin ions, such as SnF₂. Water showed an average F uptake of 136 ppm while CCP (0.243 wt % NaF) showed an average F uptake of 2286 ppm. CPH (0.454 wt % SnF₂ and sodium hexametaphosphate) showed an average Sn uptake of 4987 ppm and an average F uptake of 1038 ppm. The % efficacy of CPH vs. CCP was 17.2%, which indicated that there was 17.2% more surface protection of CPH on the HAP powder than CCP. Thus, CPH was responsible for depositing Sn, F, and sodium hexametaphosphate on the HAP powder vs. F on the HAP powder for CCP.

Example 1 had SnF₂ within the fibrous composition and sodium hexametaphosphate in the non-fibrous composition. Despite being formulated to theoretically calculated amount of fluoride ions (and by extension stannous ions), Example 1 had an average Sn uptake of 34100 ppm (nearly 7×more) and an average F uptake of 2182 ppm (2× more). Additionally, the % efficacy vs. CCP for Example 1 was 47.3% (3× higher than CPH).

As shown in TABLE 2, Example 2 was identical to Example 1 (SnF₂ in fibrous composition and sodium hexametaphosphate in the non-fibrous composition), but Example 2 did not contain a chelant, sodium gluconate. Example 1 had sodium gluconate in the fibrous composition, which was used to weakly associate with tin ions to prevent irreversible binding with other dentifrice components, such as sodium hexametaphosphate in aqueous solutions. Example 2 had an average Sn uptake of ppm (5× higher than CPH) and an average F uptake of 2401 ppm (2× more than CPH). Additionally, the % efficacy vs. CCP for Example 1 was 36.6% (2× higher than CPH). While Example 2 led to more surface absorption than CPH, Example 2 performed slightly worse than Example 1. Thus, while a chelant can be used to improve Sn uptake and total absorption, a chelant, such as gluconate, was not needed to outperform CPH.

As in TABLE 2, Example 3 was similar to the composition of Example 1, but the SnF₂ and sodium gluconate were placed in the non-fibrous composition with sodium hexametaphosphate. These compounds were in the solid phase (i.e. not dissolved or dispersed in a solvent) until hitting the aqueous treatment solution, effectively simulating the use of the unit-dose dentifrice in the oral cavity. Example 3, outperformed Example 2 and CPH, but did not reach the % efficacy or Sn uptake as Example 1, where the polyphosphate and SnF₂ were stored in separate phases. Example 4 was similar to Example 3, except without the sodium gluconate chelant. As expected, the removal of the chelant led to a slightly worse performance compared with Example 3, but still a superior performance relative to commercially available dentifrice compositions, such as CPH or CCP.

Example 5 had NaF in the fibrous composition and CaCl₂ in the non-fibrous composition. The average F uptake was 5765 ppm, which was significantly higher than the corresponding paste dentifrice, CCP, which had an average F uptake of 2286 ppm, despite being formulated to provide the same number of total F ions. Thus, Example 5 had significantly higher amounts of bioavailable F ions, or F ions which were not tied up due to reactivity with other components.

Some of the increase in fluoride uptake likely occurred from adsorption of F on the HAP surface while some likely occurred because of formation of CaF₂, during analysis, which was recovered during centrifugation. This is consistent with the observation that some of the particles did not wet completely suggesting a new particle was formed. In the oral cavity, instantaneous formation of CaF₂ upon dissolution may increase the retention and availability of fluoride over the course of minutes to hours as the deposited CaF₂ can slowly interact with the HAP.

While it was normally expected that Ca and F would react prior to deposition in the oral cavity, physically separating Ca (in the non-fibrous composition) and F (in the fibrous composition) unexpectedly resulted in a superior average F uptake and the observation of CaF₂ deposition (vs. adsorption) on the surface of HAP. While not wishing to be being bound by theory, the same result is expected to occur if Ca in formulated in the fibrous composition and the fluoride ions source is in the non-fibrous composition, if both ions are present as solid particles (i.e. not at least partially dissolved in a solvent) in the same composition, such as in the non-fibrous composition, or dissolved in a low water (<25% water) solvent added to the non-fibrous composition.

Enamel Fluoride Uptake

The Enamel Fluoride Uptake by FDA Method 40 is a method used to determine the amount of fluoride delivered to demineralized enamel specimens from a single 30-minute treatment of 1:3 dentifrice slurry.

A core of sound human enamel with a diameter of 3-4 mm was extracted from whole human teeth. The cores were mounted on an acrylic rod and the surfaces were ground using 600 grit. The cores were then polished with 0.05 μpolish (Alumina Suspension Gamma B, MetLab Corp, catalog #M303-128). Specimens were stored in an airtight container above a small amount of deionized water (˜1-5 mL) in a standard laboratory refrigerator (˜2-4° C.).

Each enamel specimen was inspected and samples with large cracks or uneven calcification were discarded. Specimens were polished again for 10 minutes using 0.05 μpolish. Samples were sonicated with a sonicator in deionized water for 15-30 min. Enamel specimens were then rinsed with standard deionized water and wiped to remove any residual polish.

Enamel specimens were then demineralized. 25 mL of MHDP (N-2-hydroxyethyl, methane hydroxy diphosphonate) demineralization solution (0.025M lactic acid, 2×10-4M MHDP) was placed in a 30 mL plastic vial for each specimen. An enamel specimen was placed on the cap of each vial. Each cap was placed on the top of the vial to submerge the enamel specimen in the MHDP demineralization solution. The enamel specimen was not allowed to touch the bottom of the vial. Specimens were left in the demineralization solution for 48 hours at ambient conditions to form artificial caries lesions. The rods were tapped twice daily to remove any bubbles. After 48 hours, specimens were removed from the demineralization solution and rinsed thoroughly with deionized water.

If the sample was a paste dentifrice, 10 g of dentifrice was placed in a 50 mL tri-pour plastic beaker. 30 mL of deionized water was added to the beaker. An x-shaped stir bar was placed on top of the dentifrice in each beaker and the beaker was placed on a magnetic stir plate. The dentifrice was broken up with a wooden stick until the stir bar is capable of spinning freely at 300-400 rpm. The dentifrice slurry was stirred for 20 minutes. The slurry was transferred to a centrifuge tube and centrifuged for 30 minutes at 11,000 rpm.

If the sample was a solid dentifrice, 10 doses of the solid form dentifrice was weighed and placed in a 50 mL tri-pour plastic beaker. Deionized water was added to bring the combined water and sample mass to 10 g. 30 mL of additional deionized water was then placed in the beaker. An x-shaped stir bar was placed on top of the dentifrice in each beaker and the beaker was placed on a magnetic stir plate. The slurry was mixed at 300-400 rpm for 20 minutes. The slurry was transferred to a centrifuge tube and centrifuged for 30 minutes at 11,000 rpm.

Slurry supernatants (for the solid and paste forms) were decanted into a 50 mL tri-pour plastic beaker. An x-shaped stir bar was placed in the beaker and the beaker was placed on a magnetic stir plate. The stir plate was turned to 300-400 rpm. Lesioned enamel specimens were suspended into each treatment. Each sample was treated for 30 minutes. After 30 minutes, each sample was rinsed with deionized water. Samples were stored in an airtight container above a small amount of deionized water (˜1-5 mL) in a standard laboratory refrigerator (˜2-4° C.).

The samples were analyzed for fluoride content analysis by collecting the milled enamel powder following drilling and dissolving that enamel in acid then neutralizing and buffering it. Upon drilling a sample from the enamel specimen, the area of the enamel drilled was recorded.

Fluoride uptake was directly measured using a Fluoride Ion Specific Electrode (Thermo Scientific, Orion, 96-09-00, Waltham, Mass.). Each specimen sample was placed on the end of the electrode. A value of mV was recorded. This value was converted to ppm fluoride by using a standard curve of prepared fluoride standards. Fluoride uptake was calculated by dividing the mass of fluoride in μg by the total area sampled with the microdrill biopsy.

The Enamel Fluoride Uptake method is based upon FDA Test Method #40. The results for enamel fluoride uptake are provided in TABLE 4.

Mean Fluoride Released

A stock fluoride solution (0.5 mg/mL, 500 ppm, Ricca, RC3172-16, Arlington, Tex.) was diluted to make solutions of 25 ppm, 50 ppm, and 250 ppm using deionized water. Each standard was diluted at a 1:1 ratio with TISAB II (Ricca, RC867016, Arlington, Tex.) buffer solution to create calibration solutions.

A calibration curve was created using the calibration solutions. 200 μL of 25 ppm calibration solution was placed in a microsample cup. A fluoride electrode was placed in the solution and the mV of each sample is noted. The procedure was repeated for each prepared calibration solution. A calibration curve was constructed by plotting mV vs. Log [F-].

Paste dentifrice samples were prepared by weighing approximately 4 g of each paste sample in a 70 mL speed mixer cup. Solid dentifrice samples were prepared by weighing 4 doses of each dentifrice samples and adding deionized water to QS at 4 g. Next, 12 mL of deionized was added to the sample cup. The speed mixer cup was mixed for 60 seconds (FlackTek Speedmixer, Landrum, SC) using Speedmixer Program #7, which is 800 rpm for 5 seconds and then 2200 rpm for 55 seconds. The slurry samples were transferred into a centrifuge tube and then centrifuged for 10 minutes at 11,000 rpm.

Samples were prepared for analysis by combining 1 mL of the supernatant and 1 mL of fresh TISAB II buffer. The samples were quickly mixed using a vortex mixer. 200 μL of the solution were transferred to a micro sample cup. The fluoride electrode was placed in the cap. The value (mV) was recorded.

Values for released fluoride were calculated using Formula 1, provided below.

$\begin{matrix} {{{Percent}{Fluoride}{Released}} = \frac{{{Average}\lbrack F\rbrack}{ppm} \times {Dilution}{Factor} \times 100}{{Labeled}{Fluoride}{Level}}} & {{Formula}I} \end{matrix}$

[F]=Fluoride Concentration of Sample Supernatant (ppm)

Dilution Factor:

NaF and SnF₂=4—(Formula % Insoluble Raw Materials/100)*Insoluble Raw Materials (IRM) include silica, titanium dioxide, mica, and prills.

TABLE 3 Compositions Tested Ex. 6 Ex. 7 Ex. 8 Ex. 9 Components (wt %) (wt %) (wt %) (wt %) Distilled Water 3.0 3.0 13.0  3.0 Polyvinyl 24.26 29.10 — — Alcohol¹ Sodium 4.85 4.85 — — Saccharin Sodium Lauryl 16.98 19.40 — — Sulfate (powder) Sodium Lauryl 25.46 14.55 — — Sulfate (solution) Sorbitol 20.61 1.67 — 20.23 Cocamidopropyl 2.43 8.49 — — betaine Sodium — 13.05 — — Gluconate Citric Acid — 0.02 — — PVP K60 — — 82.46 — PVOH — — — 72.27 NaF 2.43 — — — SnF₂ — 5.87  4.54  4.50 Total 100 100 100    100    ¹Mixture of PVA403 and PVA420H

TABLE 4 Average Fluoride Uptake Formulation Fluoride Level Average Fluoride Uptake Treatment (ppm) (μg F/cm²) NaF USP^(a) 1100 8.45 SnF₂ USP^(b) 1100 10.00 Ex. 6 1100 9.32 Ex. 7 1100 23.33^(c) Ex. 8 1100 8.76 Ex. 9 1100 5.27 ^(a)USP sodium fluoride standard in water ^(b)USP stannous fluoride standard in water ^(c)Average of two treatment regimens

TABLE 4 shows the average fluoride uptake of Ex. 6-9 compared with a NaF USP standard and a SnF USP standard according to FDA method #40 as described herein. Ex. 6-9 are formulated to theoretically provide 1100 ppm of fluoride. Ex. 6 (NaF) had an average fluoride uptake of 9.32 μg F/cm² while the Na USP standard had an average fluoride uptake of 8.45 μg F/cm². Thus, a unit dose oral care composition that isolates fluoride from other reactive components of a toothpaste, as described herein and shown by Ex. 6, outperformed a NaF USP standard.

Additionally, Ex. 7 (SnF₂) had an average fluoride uptake of 23.33 μg F/cm² while the SnF₂ USP standard had an average uptake of 10.00 μg F/cm². The average fluoride uptake of Ex. 7 was so unexpectantly high that a second run was performed to confirm the result. Thus, a unit dose oral care composition that isolates fluoride from other reactive components of a toothpaste, as described herein and shown by Ex. 7, outperformed a SnF₂ USP standard.

TABLE 5 1 Minute Fluoride Release Formulation Mean Mean Fluoride Fluoride Fluoride Level Released Released Treatment (ppm) (ppm) (%) Ex. 6 1100 1062.0 96.5 Ex. 7 1100 1088.9 99.0 Ex. 8 1100 808.2 73.5 Ex. 9 1100 1017.1 92.5 Crest ® Cavity Protection 1100 1004.0 91.3 (NaF) SnF₂ USP (SnF₂) 1100 796.4 72.4

TABLE 5 shows the 1 minute fluoride release of the unit dose oral care compositions of TABLE 3. Ex. 6 (NaF) and Ex. 7 (SnF₂) released 96.5% and 99.0% of its fluoride ions within 1 minute of contacting water. In comparison, dentifrice compositions, such as Crest® Cavity Protection and SnF₂ USP only released 91.3% and 72.4%, respectively, of fluoride ions by 1 minute. Thus, the unit-dose oral care compositions of Ex. 6 and 7 can outperform conventional dentifrice compositions by releasing biologically available fluoride ions within 1 minute. Without wishing to being bound by theory, a quick release of fluoride ions can be advantageous because individuals using dentifrice compositions to provide fluoride may not always brush with the dentifrice compositions for a long enough time to receive the full benefit of the dentifrice compositions.

The compositions shown in Table 6 were made according to the method described above for the compositions in Table 1. The non-fibrous compositions in Ex. 10-14 were entirely enclosed by the fibrous composition. For Ex. 10, the diameter of the fibrous composition was about 0.69 in, and the diameter of the non-fibrous composition was about 0.63 in.

TABLE 6 Unit-dose oral care compositions Ex. 10 Ex. 11 Ex. 1212 Ex. 13 Ex. 1414 Location Ingredient (% wt) (% wt) (% wt) (% wt) (% wt) Fibrous Water 0.78 Compo- Sodium 9.02 12.59 12.59 12.59 9.52 sition Lauryl Sulfate¹ Cocamido- 0.32 0.38 0.38 0.38 0.28 propyl Betaine Polyvinyl 8.76 7.40 7.40 7.40 8.11 Alcohol² NaF 0.80 Flavor 0.74 0.74 0.74 Sodium 1.24 1.48 1.48 1.48 1.48 Saccharin Xylitol 5.81 6.96 6.96 6.96 7.01 Sucralose 0.08 0.09 0.09 0.09 0.09 Non- Flavor 4.72 5.56 5.56 5.56 5.57 fibrous Sodium 13.89 18.52 18.52 18.52 16.39 Compo- Hexameta- sition phosphate PEG 12 28.16 18.21 17.82 17.62 19.60 Poloxamer 2.78 407 Silica 23.60 27.78 27.78 27.78 31.15 NaF 0.84 0.31 0.70 0.90 Dye 0.0009 0.0009 0.009 0.0016 FD&C Blue #1 ¹Powder ²Mixture of PVA403 and PVA420H

TABLE 7 Reference Dentifrice Formulations Inactive Ingredient Ex. 15 USP NaF Formulation Carbomer 0.300 0.300 Carboxymethyl 0.750 — Cellulose FD&C Blue 0.050 0.050 Flavor 0.810 0.900 Hydrated Silica 15.000 20.000 Saccharin Sodium 0.130 0.130 Sodium Fluoride 0.111 0.243 Sodium Lauryl Sulfate 4.000 4.000 Sol (29%) Sodium Phosphate 0.419 0.590 Monobasic Monohydrate Sorbitol Solution (70%) 65.641 60.172 Titanium Dioxide 0.525 0.525 Tribasic Sodium 1.100 1.450 Phosphate Dodecahydrate Water 11.165 11.165 Xanthan Gum — 0.475

TABLE 8 Ingredient List of Commercial Formulations Colgate ® Anywhere Anti- Crest ® Colgate ® Cavity cavity Fluoride Crest ® Cavity ProHealth ™ Etee Chewpaste Protection Tooth Tabs Protection Densify ™ with Fluoride Sodium Sodium Sodium Fluoride Stannous Sodium Fluoride Monofluorophos Monofluorophos (0.243%) Fluoride (0.25%) phate (0.76%) phate (0.76%) (0.454%) Dicalcium Xylitol Sorbitol Glycerin Dicalcium Phosphate Phosphate Dihydrate Water Mannitol Water Sorbitol Kaolin Glycerin Dicalcium Hydrated Silica Water Xylitol Phosphate Dihydrate Sodium Lauryl Sodium Sodium Lauryl Hydrated Silica Erythritol Sulfate Bicarbonate Sulfate Cellulose Gum PVP Trisodium Sodium Lauryl Magnesium Phosphate Sulfate Stearate, Flavor Hydrated Silica Flavor Sodium Citrate Sodium Lauryl Sulfoacetate Tetrasodium Magnesium Sodium Flavor Sodium Pyrophosphate Stearate Phosphate Bicarbonate Sodium Calcium Cellulose Gum Sodium Mint Flavor Saccharin Carbonate Gluconate Hydroxyethyl Carbomer Carrageenan Hydroxypropyl cellulose methylcellulose Flavor Sodium Xanthan Gum Clay Saccharin Sodium Cocoyl Titanium Dioxide Sodium Vanilla Flavor Glutamate Saccharin PEG/PPG-116/66 FD&C Blue Cocamidopropyl Eucalyptol Copolymer Betaine Cellulose Gum Sodium Xanthan Gum Hydroxide Rebaudioside A Stannous Citric Acid Chloride Sucralose Menthol Titanium Dioxide

Salivary Fluoride Pharmacokinetic Profile

Treatment Instructions and Saliva Collection Method

Generally healthy subjects were enrolled. Eligible participants were at least 18 years of age, had a minimum of 16 natural teeth, and an unstimulated salivary flow rate of 0.3-0.6 mL/min. Participants were asked not to change their current oral hygiene routine for the duration of each study and were given a fluoride-free/silica toothpaste (Burt's Bees Purely White) for at-home use the night prior to and morning of their study visits to avoid any carryover of fluoride. All treatments were performed in a clinical setting under dental professional staff supervision. Subjects were provided with pre-weighed rinse or toothpaste, and used products as instructed.

During the treatment phase and while under staff supervision, subjects were asked to provide baseline saliva samples by letting their saliva gently pool in their mouth before expectorating into a pre-labeled collection vial. After the baseline saliva collections, subjects were instructed to brush with the appropriate treatment for 2 minutes.

Supervised brushing instructions for a traditional dentifrice composition are listed below. Subjects will brush with an indicated amount of fluoride dentifrice.

-   -   a) Set timer for 2 minutes.     -   b) Move brush around mouth briefly to disperse paste relatively         evenly across each quadrant.     -   c) Start the timer as soon as the brushing begins.     -   d) Begin brushing in one quadrant. Continue brushing in each         quadrant for exactly 30 seconds, 10 seconds per surface (buccal,         lingual, coronal), for a total brushing time of 2 minutes.     -   e) Allow toothpaste slurry to collect in front of mouth, and in         one action, expectorate all toothpaste.     -   f) Rinse with 10 mL of fluoride-free water, gently swish for 10         seconds, equal time per quadrant, and in one action,         expectorate.         Supervised brushing instructions for a soluble unit dose         dentifrice composition are listed below. Study personnel will         wet the brush, apply single unit-dose dentifrice, and wet it for         3 seconds with fluoride-free water.     -   a) Set timer for 2 minutes.     -   b) Move brush around mouth briefly to disperse paste relatively         evenly across each quadrant.     -   c) Start the timer as soon as the brushing begins.     -   d) Begin brushing in one quadrant. Continue brushing in each         quadrant for exactly 30 seconds, 10 seconds per surface (buccal,         lingual, coronal), for a total brushing time of 2 minutes.     -   e) Allow toothpaste slurry to collect in front of mouth, and in         one action, expectorate all toothpaste.     -   f) Rinse with 10 mL of fluoride-free water, gently swish for 10         seconds, equal time per quadrant, and in one action,         expectorate.         Supervised brushing instructions for a pressed tablet unit dose         dentifrice composition are listed below. Subjects will take a         tablet unit dose into their mouth, crush it between their teeth,         then brush with a pre-wetted toothbrush.     -   a) Set timer for 2 minutes.     -   b) Move brush around mouth briefly to disperse paste relatively         evenly across each quadrant.     -   c) Start the timer as soon as the brushing begins.     -   d) Begin brushing in one quadrant. Continue brushing in each         quadrant for exactly 30 seconds, 10 seconds per surface (buccal,         lingual, coronal), for a total brushing time of 2 minutes.     -   e) Allow toothpaste slurry to collect in front of mouth, and in         one action, expectorate all toothpaste.     -   f) Rinse with 10 mL of fluoride-free water, gently swish for 10         seconds, equal time per quadrant, and in one action,         expectorate.         Two minutes prior to the collection timepoint following         brushing, expectorating, and rinsing, subjects were instructed         to swallow, and a timer was immediately started. Subjects         allowed their saliva to pool. With 20 seconds remaining until a         collection timepoint, panelists gently swished the accumulated         saliva around each quadrant, 5 seconds per quadrant. At the         collection timepoint, in one action, panelists expectorated the         pooled saliva into the collection vial. This process for sample         collection was repeated at 2, 6, 12, and 30 minutes         post-brushing. All samples were stored on lab ice for up to 6         hours and then shipped on dry ice overnight to be frozen at         −70° C. until processing.

Sample Preparation and Analysis

Salivary samples were prepared and analyzed by filtering and diluting with water prior to injection on an ion chromatograph using a commercially available analytical column for separation with suppressed conductivity detection. Results were calculated using a quadratic calibration curve generated from a series of known fluoride standards.

All method parameters were developed and validated consistent with FDA's 2018 Guidance for Industry related to Bioanalytical Method Validation, specifically as it applies to chromatographic assays. The fluoride analysis method was validated to the appropriate level for the intended purpose of these developmental studies. Calibration standards and Quality Control (QC) samples were prepared with NIST-traceable fluoride standard solution in saliva matrix. The working range of the method was established from ˜3 ppb to ˜100 ppb F— ion injected. Selectivity was confirmed and saliva shown to be free of interfering substances, with no observed matrix effects. Sensitivity of the method has been established at 3.13 ppb F— ion injected, Lower Limit of Quantification (LLOQ) is 0.0783 ppm F— ion in saliva. Freeze/thaw stability and critical solution stability was established at 3 cycles and 6 weeks at −70° C., respectively. Accuracy, Precision, and Recovery consistently met acceptance criteria for both bioanalytical method validation and in-study analysis recommendations.

The analytical method sample preparation scheme was specifically developed to minimize handling and eliminate any potential sources of either fluoride addition or adsorption to/from consumable materials used in sample preparation. The analytical technique chosen was Ion Chromatography, as it provides high sensitivity without addition of any reagent to the incurred sample that may potentially further liberate or suppress F— ion. The saliva was simply passed through a 5 μm PTFE filter and diluted with filtered, DI water. A commercially available analytical column was used in this method to ensure the methodology is accessible and reproducible in external laboratories. Samples were quantified against a calibration curve prepared by serial dilution of F— reference standard in saliva matrix. Daily method performance was verified through QC analysis at High, Middle, and Low levels per FDA guidance.

Data Fitting for Salivary Fluoride pK AUC Calculation

The general approach was to fit the data points with an exponential decay curve with a constant intercept. Because of the exponential decay, there was little change in the saliva fluoride concentration values for data collected after 30 minutes. This approach greatly simplified the data analysis yet gave robust AUC results.

Due to the decay nature of the salivary fluoride curve, AUC_(2-t) (AUC from 2 minutes until time t) was deemed the primary measure for assessment. A 3-parameter first order decay model curve (y=θ₁×exp(−θ₂·X)+θ₃) was used to fit the data and subsequently integrated to obtain the salivary fluoride pK AUC. The decay curve was fit for each subject at each period using SAS (SAS® version 9.3 or later) across the available timepoints; the curve was integrated to obtain the AUC₂₋₃₀. All salivary fluoride pK studies were analyzed using this approach.

Non-inferiority of the treatment groups was evaluated using a generalized mixed model with treatment and period as fixed effects, baseline salivary fluoride value as a covariate, and subject as a random effect. The experimental treatment was deemed non-inferior to the control (reference toothpaste) if the performance mean from the above model for the experimental treatment divided by the control treatment is above 60%. For the experiments discussed below, a treatment mass for the reference toothpaste was 1 g or 1.25 g.

TABLE 9 Salivary pK AUC Values Treatment F Conc F Dose % Ref Treatment Mass (g) (ppm) (mg) AUC Std NI? USP NaF Formulation 1.25 1100 1.375 37.4 — — Ex. 15: F in Toothpaste 1.25 500 0.625 17.2 46 No Ex. 10: F in Non- 0.36 3819 1.375 35.0 94 Yes Fibrous Comp

The Ex. 15 composition in TABLE 9 used the same treatment mass, but at a lower fluoride concentration. As expected, when comparing one toothpaste to another, the primary driver of efficacy is the fluoride concentration. In this case, the AUC of Ex. 15 was 46% of the AUC of the USP NaF Reference Standard, meaning the performance of Ex. 15 was inferior with respect to the USP NaF Reference Standard. Interestingly, the Ex. 10 composition in TABLE 6 had a much lower mass and much higher concentration of fluoride than the USP NaF Reference Standard. Unexpectedly, this very different treatment mass and active concentration yielded a non-inferior result with respect to the USP NaF Reference Standard. This composition did use the same F dose as the USP NaF Reference Standard. However, supplying the same dose of fluoride is not a guarantee of non-inferiority for a unit dose.

TABLE 10 Salivary pK AUC Values Treatment F Conc F Dose % Ref Treatment Mass (g) (ppm) (mg) AUC Std NI? USP NaF Formulation 1.00 1100 1.100 60.1 — — Ex. 15: F in Toothpaste 1.00 500 0.500 25.2 42 No Ex. 14: F in Fibrous 0.305 3607 1.100 25.3 42 No Comp Ex. 13: F in Non- 0.270 4074 1.100 59.7 99 Yes Fibrous Comp Ex. 12: F in Non- 0.270 3148 0.850 29.3 49 No Fibrous Comp Ex. 11: F in Non- 0.270 1400 0.378 12.7 21 No Fibrous Comp

Table 10 shows the results of Ex. 10-14 (heterogenous compositions) and Ex. 15 in comparison with the USP NaF Reference Standard. Again, the performance of Ex. 15 in TABLE 10 was inferior with respect to the USP NaF Reference Standard. Ex. 14 in TABLE 10 also had a lower treatment mass and higher concentration of fluoride than the USP NaF Reference Standard; however, the fluoride was distributed to the fibrous composition instead of the non-fibrous concentration. Distributing the fluoride in this way led to a failure to achieve non-inferior performance for this unit dose relative to the USP NaF Reference Standard even though the dose of fluoride was the same. The performance of Ex. 13 was non-inferior to the USP NaF Reference Standard, again despite having a much lower treatment mass and much higher fluoride concentration than the USP NaF Reference Standard. Interestingly, both the performance of Ex. 12 and that of Ex. 11 were inferior to the USP NaF Reference Standard. In the cases of Ex. 12 and Ex. 11, both had higher concentrations of fluoride and lower doses of fluoride than the USP NaF Reference Standard. It should be apparent from these results that the distribution of fluoride within the heterogenous unit-dose compositions can affect the delivery of fluoride to the mouth; however, the impact of the fluoride distribution is difficult to determine a priori. The inclusion of the fluoride in the fibrous element for Ex. 14 was intended to more completely and more rapidly deliver fluoride to the mouth. That was not achieved. Instead, and surprisingly, the delivery was reduced. Further, among examples where the fluoride was distributed in the non-fibrous composition and the composition had the same treatment mass, the fluoride dose was not linearly proportional to the AUC. For example, Ex. 12 had a fluoride dose that was 77% of the fluoride dose of Ex. 13, but the AUC of Ex. 12 was about half that of Ex. 13.

In none of the examples were the fluoride concentration, treatment mass, or fluoride dose sufficient on their own to anticipate the measured salivary pK AUC of fluoride measured from 2-30 minutes after brushing. The examples evaluated in Experiments 1-3 indicate that fluoride release and dispersal from an oral care composition can be significantly altered due to (i) presence of excipients, (ii) dose form, (iii) concentration of fluoride, (iv) dose of fluoride, and (v) distribution of fluoride within a heterogeneous composition, and (vi) manufacturer's usage instructions. Accordingly, solid or semi-solid unit-dose oral care compositions can suffer from lower-than-expected delivery of fluoride ion to the oral cavity. These dependencies are difficult to anticipate a priori. The results herein demonstrate how to formulate a unit-dose composition that delivers a non-inferior amount of fluoride to the oral cavity with respect to a reference toothpaste thus helping to ensure effective anticavity efficacy as a reference toothpaste.

Every document cited herein, including any cross referenced or related patent or application and any patent application or patent to which this application claims priority or benefit thereof, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.

While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention. 

What is claimed is:
 1. A unit-dose oral care composition comprising: (a) fibrous composition comprising web forming material; and (b) a non-fibrous composition comprising a fluoride ion source, wherein the unit-dose oral care composition is a solid unit-dose oral care composition.
 2. The unit-dose oral care composition of claim 1, wherein the fibrous composition comprises a first web and a second web, and the non-fibrous composition is between the first web and the second web.
 3. The unit-dose oral care composition of claim 1, wherein the fibrous composition is folded on top of the non-fibrous composition.
 4. The unit-dose oral care composition of claim 1, wherein the fluoride ion source comprises sodium fluoride, sodium monofluorophosphate, stannous fluoride, amine fluoride, or combinations thereof.
 5. The unit-dose oral care composition of claim 1, wherein the composition comprises from about 0.01% to about 10%, by weight of the unit-dose oral care composition, of a metal ion source, wherein the metal ion source comprises stannous ion source, zinc ion source, or combinations thereof.
 6. The unit-dose oral care composition of claim 1, wherein the unit-dose oral care composition comprises from about 1% to about 50%, by weight of the unit-dose oral care composition, of the web forming material.
 7. The unit-dose oral care composition of claim 6, wherein the web forming material comprises starch, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, carboxymethylcellulose, polyacrylic acid, polyvinyl ether maleic acid copolymer, or combinations thereof.
 8. The unit-dose oral care composition of claim 1, wherein the unit-dose oral care composition has from about 0.01% to about 10%, by weight of the unit-dose oral care composition, of the fluoride ion source.
 9. The unit-dose oral care composition of claim 1, wherein the unit-dose oral care composition has at least about a 1500 ppm fluoride uptake.
 10. The unit-dose oral care composition of claim 1, wherein the unit-dose oral care composition comprises from about 0.01% to about 40%, by weight of the unit-dose oral care composition, of a calcium ion source.
 11. The unit-dose oral care composition of claim 10, wherein the calcium ion source comprises calcium abrasive, calcium salt, or combinations thereof.
 12. The unit-dose oral care composition of claim 10, wherein the unit-dose oral care composition has at least about a 1000 ppm average fluoride uptake.
 13. The unit-dose oral care composition of claim 10, wherein the fibrous composition comprises the calcium ion source.
 14. The unit-dose oral care composition of claim 10, wherein the calcium ion source comprises the calcium salt, and the unit-dose oral care composition further comprises an abrasive.
 15. The unit-dose oral care composition of claim 1, further comprising an abrasive.
 16. The unit-dose oral care composition of claim 1, wherein the unit-dose oral care composition comprises a salivary fluoride pK AUC that is at least 60% of a reference salivary fluoride pK AUC of a reference standard toothpaste having a reference treatment mass in a range of about 1 g to about 1.25 g when the unit-dose oral care composition is dosed according to manufacturer instructions.
 17. The unit-dose oral care composition of claim 16, wherein the unit-dose oral care composition comprises a salivary fluoride pK AUC that is at least 80% of the reference salivary fluoride pK AUC. 